Upgrade ORA to 2.6.12 | When fetching file URLs from keys stored in Submission...

Upgrade ORA to 2.6.12 | When fetching file URLs from keys stored in Submission records, don't break just because we encountered one missing file; there might be more, existing files after it.

requirements/edx/base.txt

@@ -169,7 +169,7 @@ nodeenv==1.3.5
 numpy==1.18.1             # via scipy
 git+https://github.com/joestump/python-oauth2.git@b94f69b1ad195513547924e380d9265133e995fa#egg=oauth2
 oauthlib==2.1.0
-git+https://github.com/edx/edx-ora2.git@2.6.11#egg=ora2==2.6.11
+git+https://github.com/edx/edx-ora2.git@2.6.12#egg=ora2==2.6.12
 packaging==20.1           # via drf-yasg
 path.py==12.4.0           # via edx-enterprise, edx-i18n-tools
 path==13.1.0

requirements/edx/development.txt

@@ -203,7 +203,7 @@ nodeenv==1.3.5
 numpy==1.18.1
 git+https://github.com/joestump/python-oauth2.git@b94f69b1ad195513547924e380d9265133e995fa#egg=oauth2
 oauthlib==2.1.0
-git+https://github.com/edx/edx-ora2.git@2.6.11#egg=ora2==2.6.11
+git+https://github.com/edx/edx-ora2.git@2.6.12#egg=ora2==2.6.12
 packaging==20.1
 pandas==0.22.0
 path.py==12.4.0

requirements/edx/github.in

@@ -86,7 +86,7 @@ git+https://gitlab.com/Ayub-khan/django-method-override.git@5270af321be2e576d8e8
 # Our libraries:
 -e git+https://github.com/edx/codejail.git@4127fc4bd5775cc72aee8d7f0a70e31405e22439#egg=codejail
 -e git+https://github.com/edx/acid-block.git@98aecba94ecbfa934e2d00262741c0ea9f557fc9#egg=acid-xblock
-git+https://github.com/edx/edx-ora2.git@2.6.11#egg=ora2==2.6.11
+git+https://github.com/edx/edx-ora2.git@2.6.12#egg=ora2==2.6.12
 git+https://github.com/edx/crowdsourcehinter.git@a7ffc85b134b7d8909bf1fefd23dbdb8eb28e467#egg=crowdsourcehinter-xblock==0.2
 -e git+https://github.com/edx/RateXBlock.git@2.0#egg=rate-xblock
 -e git+https://github.com/edx/DoneXBlock.git@2.0.1#egg=done-xblock

requirements/edx/testing.txt

@@ -194,7 +194,7 @@ nodeenv==1.3.5
 numpy==1.18.1
 git+https://github.com/joestump/python-oauth2.git@b94f69b1ad195513547924e380d9265133e995fa#egg=oauth2
 oauthlib==2.1.0
-git+https://github.com/edx/edx-ora2.git@2.6.11#egg=ora2==2.6.11
+git+https://github.com/edx/edx-ora2.git@2.6.12#egg=ora2==2.6.12
 packaging==20.1
 pandas==0.22.0
 path.py==12.4.0