Bump pytest-django from 4.8.0 to 4.9.0 in /.github/workflows

Bumps [pytest-django](https://github.com/pytest-dev/pytest-django) from 4.8.0 to 4.9.0.
- [Release notes](https://github.com/pytest-dev/pytest-django/releases)
- [Changelog](https://github.com/pytest-dev/pytest-django/blob/main/docs/changelog.rst)
- [Commits](pytest-dev/pytest-django@v4.8.0...v4.9.0)

---
updated-dependencies:
- dependency-name: pytest-django
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/constraints.txt

@@ -6,4 +6,4 @@ poetry==1.8.3
 poetry-plugin-export==1.8.0
 pytest==8.2.1
 pytest-cov==5.0.0
-pytest-django==4.8.0
+pytest-django==4.9.0