Bump django-stubs from 1.16.0 to 4.2.0 in /requirements (#403)

Bumps [django-stubs](https://github.com/typeddjango/django-stubs) from 1.16.0 to 4.2.0.
- [Release notes](https://github.com/typeddjango/django-stubs/releases)
- [Commits](typeddjango/django-stubs@1.16.0...4.2.0)

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

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

Author: dependabot[bot]

requirements/local.txt

@@ -12,7 +12,7 @@ django-coverage-plugin==3.0.0  # https://github.com/nedbat/django_coverage_plugi
 coverage==7.2.5  # https://github.com/nedbat/coveragepy
 
 # Code quality
-django-stubs==1.16.0  # https://github.com/typeddjango/django-stubs
+django-stubs==4.2.0  # https://github.com/typeddjango/django-stubs
 types-freezegun==1.1.10  # https://github.com/python/typeshed
 mypy==1.2.0  # https://github.com/python/mypy
 black==23.3.0  # https://github.com/ambv/black