Bump django-stubs-ext from 5.1.0 to 5.1.1

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:production
  update-type: version-update:semver-patch
...

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

pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
     "django-oauth-toolkit==3.0.1",
     "django-pictures==1.3.3",
     "django-polymorphic==3.1.0",
-    "django-stubs-ext==5.1.0",
+    "django-stubs-ext==5.1.1",
     "django-tables2==2.7.0",
     "django-taggit==6.1.0",
     "environs[django]==11.0.0",