Bump djangorestframework from 3.15.1 to 3.15.2 in /server

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.15.1 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.15.1...3.15.2)

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

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

server/requirements.txt

@@ -3,7 +3,7 @@ django-celery-results==2.5.1
 django-cors-headers==4.3.1
 django-extensions==3.2.3
 django-celery-beat==2.6.0
-djangorestframework==3.15.1
+djangorestframework==3.15.2
 gunicorn==22.0.0
 emanifest==4.0.3
 psycopg[binary]==3.1.19