Revert "Unpin python-dateutil (#26171)"

This reverts commit 0b32f0a3.

requirements/constraints.txt

@@ -42,6 +42,9 @@ edx-enterprise==3.17.14
 # Upgrading to 2.12.0 breaks several test classes due to API changes, need to update our code accordingly
 factory-boy==2.8.1
 
+# Newer versions need a more recent version of python-dateutil
+freezegun==0.3.12
+
 # When we went from httpretty 0.9.7 to 1.0.2, tests broke
 httpretty<1.0
 
@@ -91,6 +94,9 @@ pillow<8.0.0
 # ARCHBOM-1141: pip-tools upgrade requires pip upgrade
 pip-tools<5.0.0
 
+# Upgrading to 2.5.3 on 2020-01-03 triggered "'tzlocal' object has no attribute '_std_offset'" errors in production
+python-dateutil==2.4.0
+
 # stevedore 2.0.0 requires python >= 3.6
 stevedore<2.0.0
 

requirements/edx-sandbox/py35.txt

@@ -20,11 +20,11 @@ matplotlib==2.2.4         # via -c requirements/edx-sandbox/../constraints.txt,
 mpmath==1.1.0             # via sympy
 networkx==2.2             # via -r requirements/edx-sandbox/py35.in
 nltk==3.5                 # via -r requirements/edx-sandbox/shared.txt, chem
-numpy==1.16.5             # via -c requirements/edx-sandbox/../constraints.txt, -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc
+numpy==1.16.5             # via -c requirements/edx-sandbox/../constraints.txt, -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc, scipy
 openedx-calc==1.0.9       # via -r requirements/edx-sandbox/py35.in
 pycparser==2.20           # via -r requirements/edx-sandbox/shared.txt, cffi
 pyparsing==2.2.0          # via -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc
-python-dateutil==2.8.1    # via matplotlib
+python-dateutil==2.4.0    # via -c requirements/edx-sandbox/../constraints.txt, matplotlib
 pytz==2020.5              # via matplotlib
 random2==1.0.1            # via -r requirements/edx-sandbox/py35.in
 regex==2020.11.13         # via -r requirements/edx-sandbox/shared.txt, nltk

requirements/edx/base.txt

@@ -185,7 +185,7 @@ pymongo==3.10.1           # via -c requirements/edx/../constraints.txt, -r requi
 pynliner==0.8.0           # via -r requirements/edx/base.in
 pyparsing==2.4.7          # via chem, openedx-calc, packaging, pycontracts
 pysrt==1.1.2              # via -r requirements/edx/base.in, edxval
-python-dateutil==2.8.1    # via -r requirements/edx/base.in, analytics-python, botocore, edx-ace, edx-drf-extensions, edx-enterprise, edx-event-routing-backends, edx-proctoring, icalendar, ora2, xblock
+python-dateutil==2.4.0    # via -c requirements/edx/../constraints.txt, -r requirements/edx/base.in, analytics-python, botocore, edx-ace, edx-drf-extensions, edx-enterprise, edx-event-routing-backends, edx-proctoring, icalendar, ora2, xblock
 python-levenshtein==0.12.1  # via -r requirements/edx/base.in
 python-memcached==1.59    # via -r requirements/edx/paver.txt
 python-slugify==4.0.1     # via code-annotations

requirements/edx/development.txt

@@ -137,7 +137,7 @@ execnet==1.8.0            # via -r requirements/edx/testing.txt, pytest-xdist
 factory-boy==2.8.1        # via -c requirements/edx/../constraints.txt, -r requirements/edx/testing.txt
 faker==5.8.0              # via -r requirements/edx/testing.txt, factory-boy
 filelock==3.0.12          # via -r requirements/edx/testing.txt, tox, virtualenv
-freezegun==1.1.0          # via -r requirements/edx/testing.txt
+freezegun==0.3.12         # via -c requirements/edx/../constraints.txt, -r requirements/edx/testing.txt
 fs-s3fs==0.1.8            # via -r requirements/edx/testing.txt, django-pyfs
 fs==2.0.18                # via -r requirements/edx/testing.txt, django-pyfs, fs-s3fs, xblock
 future==0.18.2            # via -r requirements/edx/testing.txt, django-ses, edx-celeryutils, edx-enterprise, pycontracts, pyjwkest
@@ -237,7 +237,7 @@ pytest-metadata==1.8.0    # via -r requirements/edx/testing.txt, pytest-json-rep
 pytest-randomly==3.5.0    # via -r requirements/edx/testing.txt
 pytest-xdist[psutil]==2.2.0  # via -r requirements/edx/testing.txt
 pytest==6.2.2             # via -r requirements/edx/testing.txt, pytest-attrib, pytest-cov, pytest-django, pytest-forked, pytest-json-report, pytest-metadata, pytest-randomly, pytest-xdist
-python-dateutil==2.8.1    # via -r requirements/edx/testing.txt, analytics-python, botocore, edx-ace, edx-drf-extensions, edx-enterprise, edx-event-routing-backends, edx-proctoring, faker, freezegun, icalendar, ora2, xblock
+python-dateutil==2.4.0    # via -c requirements/edx/../constraints.txt, -r requirements/edx/testing.txt, analytics-python, botocore, edx-ace, edx-drf-extensions, edx-enterprise, edx-event-routing-backends, edx-proctoring, faker, freezegun, icalendar, ora2, xblock
 python-levenshtein==0.12.1  # via -r requirements/edx/testing.txt
 python-memcached==1.59    # via -r requirements/edx/testing.txt
 python-slugify==4.0.1     # via -r requirements/edx/testing.txt, code-annotations, transifex-client
@@ -266,7 +266,7 @@ semantic-version==2.8.5   # via -r requirements/edx/testing.txt, edx-drf-extensi
 shapely==1.7.1            # via -r requirements/edx/testing.txt
 simplejson==3.17.2        # via -r requirements/edx/testing.txt, sailthru-client, super-csv, xblock-utils
 singledispatch==3.4.0.3   # via -r requirements/edx/testing.txt
-six==1.15.0               # via -r requirements/edx/pip-tools.txt, -r requirements/edx/testing.txt, analytics-python, astroid, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-opaque-keys, edx-rbac, edx-sphinx-theme, event-tracking, fs, fs-s3fs, html5lib, httpretty, isodate, jsonschema, libsass, mock, paver, pip-tools, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, sphinxcontrib-httpdomain, stevedore, tox, transifex-client, virtualenv, xblock
+six==1.15.0               # via -r requirements/edx/pip-tools.txt, -r requirements/edx/testing.txt, analytics-python, astroid, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-opaque-keys, edx-rbac, edx-sphinx-theme, event-tracking, freezegun, fs, fs-s3fs, html5lib, httpretty, isodate, jsonschema, libsass, mock, paver, pip-tools, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, sphinxcontrib-httpdomain, stevedore, tox, transifex-client, virtualenv, xblock
 slumber==0.7.1            # via -r requirements/edx/testing.txt, edx-bulk-grades, edx-enterprise, edx-rest-api-client
 smmap==3.0.5              # via -r requirements/edx/testing.txt, gitdb
 snowballstemmer==2.1.0    # via sphinx

requirements/edx/testing.txt

@@ -133,7 +133,7 @@ execnet==1.8.0            # via pytest-xdist
 factory-boy==2.8.1        # via -c requirements/edx/../constraints.txt, -r requirements/edx/testing.in
 faker==5.8.0              # via factory-boy
 filelock==3.0.12          # via tox, virtualenv
-freezegun==1.1.0          # via -r requirements/edx/testing.in
+freezegun==0.3.12         # via -c requirements/edx/../constraints.txt, -r requirements/edx/testing.in
 fs-s3fs==0.1.8            # via -r requirements/edx/base.txt, django-pyfs
 fs==2.0.18                # via -r requirements/edx/base.txt, django-pyfs, fs-s3fs, xblock
 future==0.18.2            # via -r requirements/edx/base.txt, django-ses, edx-celeryutils, edx-enterprise, pycontracts, pyjwkest
@@ -227,7 +227,7 @@ pytest-metadata==1.8.0    # via -r requirements/edx/testing.in, pytest-json-repo
 pytest-randomly==3.5.0    # via -r requirements/edx/testing.in
 pytest-xdist[psutil]==2.2.0  # via -r requirements/edx/testing.in
 pytest==6.2.2             # via -r requirements/edx/testing.in, pytest-attrib, pytest-cov, pytest-django, pytest-forked, pytest-json-report, pytest-metadata, pytest-randomly, pytest-xdist
-python-dateutil==2.8.1    # via -r requirements/edx/base.txt, analytics-python, botocore, edx-ace, edx-drf-extensions, edx-enterprise, edx-event-routing-backends, edx-proctoring, faker, freezegun, icalendar, ora2, xblock
+python-dateutil==2.4.0    # via -c requirements/edx/../constraints.txt, -r requirements/edx/base.txt, analytics-python, botocore, edx-ace, edx-drf-extensions, edx-enterprise, edx-event-routing-backends, edx-proctoring, faker, freezegun, icalendar, ora2, xblock
 python-levenshtein==0.12.1  # via -r requirements/edx/base.txt
 python-memcached==1.59    # via -r requirements/edx/base.txt
 python-slugify==4.0.1     # via -r requirements/edx/base.txt, code-annotations, transifex-client
@@ -255,7 +255,7 @@ semantic-version==2.8.5   # via -r requirements/edx/base.txt, edx-drf-extensions
 shapely==1.7.1            # via -r requirements/edx/base.txt
 simplejson==3.17.2        # via -r requirements/edx/base.txt, sailthru-client, super-csv, xblock-utils
 singledispatch==3.4.0.3   # via -r requirements/edx/testing.in
-six==1.15.0               # via -r requirements/edx/base.txt, analytics-python, astroid, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-opaque-keys, edx-rbac, event-tracking, fs, fs-s3fs, html5lib, httpretty, isodate, libsass, mock, paver, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, stevedore, tox, transifex-client, virtualenv, xblock
+six==1.15.0               # via -r requirements/edx/base.txt, analytics-python, astroid, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-opaque-keys, edx-rbac, event-tracking, freezegun, fs, fs-s3fs, html5lib, httpretty, isodate, libsass, mock, paver, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, stevedore, tox, transifex-client, virtualenv, xblock
 slumber==0.7.1            # via -r requirements/edx/base.txt, edx-bulk-grades, edx-enterprise, edx-rest-api-client
 smmap==3.0.5              # via gitdb
 social-auth-app-django==4.0.0  # via -r requirements/edx/base.txt