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
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/requirements.txt

@@ -1,6 +1,6 @@
 Django==4.2.7
 psycopg>=3.1.8
-djangorestframework==3.14.0
+djangorestframework==3.15.2
 djangorestframework-jsonapi==6.1.0
 django-cors-headers==4.3.1
 django-filter