Upgrade to 1.0.0 caused issues which are described and being
investigated in https://github.com/django-ses/django-ses/issues/186.

Updating edx-when version to pull in a change related to not
returning dates if the enrollment happened after course end
(if no enrollment end date is set)

Move social-app-django from github to base requirement, since PyPi version is now compatible with the platform.

all versions updates were minor and no visible downgrades

Use transifex client from PyPi since required change was merged recently.

This reverts commit f3161468.

Upgrade transifex-client version.

This is only made in order to run the tests with a transifex-client version compatible with python3.8

The actual problem that we have in edx-platform is that the last version of transifex-client has as constraint python-slugify<2.0.0 which is not compatible with the current requierements of edx-platform on the other hand, the current version used in edx-platform is not compatible with python3.8

rename djang-babel to enmarker
upgrade the reqs

sympy needs to be at a newer version for python3.

* bump proctoring version to 2.4.2 (python requirements update)

* bump completion to 3.2.1 (python requirements update)

Co-authored-by: Ben Warzeski <benwarzeski@edX-C02CD0HCLVDM.cable.rcn.com>

updated the constraints order

- Updating Python Requirements
- Fix cache key generation to use class name and module

This was stringifying the class object directly, resulting in cache keys
like `:1:<class 'xblock_django.models.XBlockConfiguration'>.xblock_django.api.deprecated_xblocks`
which then cause breakage when Django 2.2.13 validates the keys.

Co-authored-by: edX requirements bot <testeng+edx-requirements-bot@edx.org>

Remove pystache_custom dependency.
Upgrade requirements.

https://openedx.atlassian.net/browse/BOM-1670

Move sorl-thumbnail dependencie from github.in to base.in since PyPi version is now compatible with DJango 2.2 and python 3.5.

ENT-2577

Remove pandas requirement.
Replace pandas functionality with itertools.group_by.

and make upgrade.