Bump djangorestframework from 3.14.0 to 3.15.0

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.14.0...3.15.0)

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

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

requirements.txt

@@ -105,7 +105,7 @@ django-taggit==3.0.0
     # via wagtail
 django-treebeard==4.5.1
     # via wagtail
-djangorestframework==3.14.0
+djangorestframework==3.15.0
     # via
     #   -r requirements.in
     #   wagtail
@@ -189,7 +189,6 @@ python3-openid==3.2.0
 pytz==2023.3.post1
     # via
     #   django-modelcluster
-    #   djangorestframework
     #   l18n
 pyyaml==6.0.1
     # via django-pattern-library