Bump djangorestframework from 3.12.4 to 3.13.1

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.12.4 to 3.13.1.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.12.4...3.13.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/base.txt

@@ -1,7 +1,7 @@
 Django==3.2.10
 django-environ==0.8.1
 psycopg2==2.9.2
-djangorestframework==3.12.4
+djangorestframework==3.13.1
 
 celery==5.2.3
 django-celery-results==2.2.0