Bump djangorestframework from 3.14.0 to 3.15.2 in /requirements

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.14.0 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.14.0...3.15.2)

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

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

requirements/base.txt

@@ -1,7 +1,7 @@
 Django==5.0.6
 django-environ==0.11.2
 psycopg2==2.9.9
-djangorestframework==3.14.0
+djangorestframework==3.15.2
 
 celery==5.3.6
 django-celery-results==2.5.1