Bump django-storages from 1.12.3 to 1.13.1 (#9833)

Bumps [django-storages](https://github.com/jschneier/django-storages) from 1.12.3 to 1.13.1.
- [Release notes](https://github.com/jschneier/django-storages/releases)
- [Changelog](https://github.com/jschneier/django-storages/blob/master/CHANGELOG.rst)
- [Commits](jschneier/django-storages@1.12.3...1.13.1)

---
updated-dependencies:
- dependency-name: django-storages
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -105,7 +105,7 @@ elasticsearch>=2.0.0,<9.0.0
 django-bootstrap3-datetimepicker-2==2.8.2
 
 # storage manager dependencies
-django-storages==1.12.3
+django-storages==1.13.1
 dropbox==11.33.0
 google-cloud-storage==2.4.0
 google-cloud-core==2.3.2