build(deps-dev): bump django-stubs-ext from 5.1.0 to 5.1.1 in /packages

Bumps [django-stubs-ext](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-ext
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

packages/requirements-dev.txt

@@ -30,7 +30,7 @@ dill==0.3.9 ; python_version >= "3.9" and python_version < "4.0"
 distlib==0.3.9 ; python_version >= "3.9" and python_version < "4.0"
 django-filter==24.3 ; python_version >= "3.9" and python_version < "4.0"
 django-migration-linter==5.1.0 ; python_version >= "3.9" and python_version < "4.0"
-django-stubs-ext==5.1.0 ; python_version >= "3.9" and python_version < "4.0"
+django-stubs-ext==5.1.1 ; python_version >= "3.9" and python_version < "4.0"
 django-stubs==5.1.0 ; python_version >= "3.9" and python_version < "4.0"
 django==4.2.16 ; python_version >= "3.9" and python_version < "3.10"
 django==5.1.2 ; python_version >= "3.10" and python_version < "4.0"