Bump pytest-django from 4.7.0 to 4.8.0 in /requirements

Bumps [pytest-django](https://github.com/pytest-dev/pytest-django) from 4.7.0 to 4.8.0.
- [Release notes](https://github.com/pytest-dev/pytest-django/releases)
- [Changelog](https://github.com/pytest-dev/pytest-django/blob/master/docs/changelog.rst)
- [Commits](pytest-dev/pytest-django@v4.7.0...v4.8.0)

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

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

requirements/local.txt

@@ -37,4 +37,4 @@ django-extensions==3.2.3
 # https://github.com/nedbat/django_coverage_plugin
 django-coverage-plugin==3.1.0
 # https://github.com/pytest-dev/pytest-django
-pytest-django==4.7.0
+pytest-django==4.8.0