Bump google-auth from 2.28.1 to 2.28.2

Bumps [google-auth](https://github.com/googleapis/google-auth-library-python) from 2.28.1 to 2.28.2.
- [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@v2.28.1...v2.28.2)

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

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

requirements.txt

@@ -5,4 +5,4 @@ simpleaichat==0.2.2
 openai<1.0.0
 tiktoken==0.6.0
 google-cloud-storage==2.14.0
-google-auth==2.28.1
+google-auth==2.28.2