Bump google-auth from 2.27.0 to 2.28.1

Bumps [google-auth](https://github.com/googleapis/google-auth-library-python) from 2.27.0 to 2.28.1.
- [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@v2.27.0...v2.28.1)

---
updated-dependencies:
- dependency-name: google-auth
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

requirements/requirements.txt

@@ -94,7 +94,7 @@ fastobo==0.12.3
     # via pronto
 fontawesomefree==6.5.1
     # via django-anvil-consortium-manager
-google-auth==2.27.0
+google-auth==2.28.1
     # via django-anvil-consortium-manager
 idna==3.3
     # via requests