Bump django-stubs from 5.1.0 to 5.1.1

Bumps [django-stubs](https://github.com/typeddjango/django-stubs) from 5.1.0 to 5.1.1.
- [Release notes](https://github.com/typeddjango/django-stubs/releases)
- [Commits](typeddjango/django-stubs@5.1.0...5.1.1)

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

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