Bump djangorestframework from 3.12.2 to 3.15.2

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.12.2 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.12.2...3.15.2)

---
updated-dependencies:
- dependency-name: djangorestframework
  dependency-type: direct:production
...

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

Author: dependabot[bot]

base-requirements.txt

@@ -41,7 +41,7 @@ django-allauth==0.50.0
 
 django-waffle==2.2.1
 
-djangorestframework==3.12.2
+djangorestframework==3.15.2
 django-filter==2.4.0
 django-ordered-model==3.4.3
 django-widget-tweaks==1.4.8