Bump djangorestframework from 3.11.2 to 3.15.2 in /requirements

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.11.2 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.11.2...3.15.2)

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

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

requirements/base.txt

@@ -16,7 +16,7 @@ social-auth-app-django==5.1.0
 social-auth-core==4.5.3
 
 # DRF and DRF-gis
-djangorestframework==3.11.2
+djangorestframework==3.15.2
 djangorestframework-gis==0.17
 djangorestframework-csv==2.1.1
 django-filter==2.4.0