⬆️ Bump djangorestframework from 3.12.4 to 3.15.2 in /server

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.12.4 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.12.4...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 @@ asyncio==3.4.3
 celery==5.2.2
 dj-database-url==0.5.0
 Django==3.2.25
-djangorestframework==3.12.4
+djangorestframework==3.15.2
 google-api-python-client==2.33.0
 pymongo==4.6.3
 python-dotenv==0.19.0