Bump google-auth from 1.28.1 to 2.28.0

Bumps [google-auth](https://github.com/googleapis/google-auth-library-python) from 1.28.1 to 2.28.0.
- [Release notes](https://github.com/googleapis/google-auth-library-python/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-python/blob/main/CHANGELOG.md)
- [Commits](googleapis/google-auth-library-python@v1.28.1...v2.28.0)

---
updated-dependencies:
- dependency-name: google-auth
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/production.txt

@@ -5,5 +5,5 @@
 
 # Django
 # ------------------------------------------------------------------------------
-google-auth==1.28.1  # https://github.com/googleapis/google-auth-library-python
+google-auth==2.28.0  # https://github.com/googleapis/google-auth-library-python
 django-storages[google]==1.14.2