build(deps): Bump pytest-django in /testing/plugins_integration

Bumps [pytest-django](https://github.com/pytest-dev/pytest-django) from 4.4.0 to 4.5.1.
- [Release notes](https://github.com/pytest-dev/pytest-django/releases)
- [Changelog](https://github.com/pytest-dev/pytest-django/blob/master/docs/changelog.rst)
- [Commits](https://github.com/pytest-dev/pytest-django/compare/v4.4.0...v4.5.1)

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

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

testing/plugins_integration/requirements.txt

@@ -3,7 +3,7 @@ django==3.2.9
 pytest-asyncio==0.16.0
 pytest-bdd==5.0.0
 pytest-cov==3.0.0
-pytest-django==4.4.0
+pytest-django==4.5.1
 pytest-flakes==4.0.5
 pytest-html==3.1.1
 pytest-mock==3.6.1