Bump django-stubs from 4.2.0 to 4.2.1

Bumps [django-stubs](https://github.com/typeddjango/django-stubs) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/typeddjango/django-stubs/releases)
- [Commits](typeddjango/django-stubs@4.2.0...4.2.1)

---
updated-dependencies:
- dependency-name: django-stubs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/requirements-test.lock.txt

@@ -50,11 +50,11 @@ django==4.2.1
     # via
     #   django-stubs
     #   django-stubs-ext
-django-stubs==4.2.0
+django-stubs==4.2.1
     # via
     #   -r requirements/requirements-test.in
     #   djangorestframework-stubs
-django-stubs-ext==4.2.0
+django-stubs-ext==4.2.1
     # via django-stubs
 djangorestframework-stubs==3.14.0
     # via -r requirements/requirements-test.in