Bump djangorestframework from 3.14.0 to 3.15.1 in /requirements (#2219)

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.14.0 to 3.15.1.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.14.0...3.15.1)

---
updated-dependencies:
- dependency-name: djangorestframework
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/project-requirements.txt

@@ -17,7 +17,7 @@ django-treebeard==4.7
 jsonschema==4.21.1
 # django rest framework libs
 Authlib==1.3.0
-djangorestframework==3.14.0
+djangorestframework==3.15.1
 djangorestframework-filters==1.0.0.dev2
 drf-spectacular==0.27.1
 django-rest-email-auth==4.0.0