Update google-auth requirement in /backend

Updates the requirements on [google-auth](https://github.com/googleapis/google-auth-library-python) to permit the latest version.
- [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](https://github.com/googleapis/google-auth-library-python/commits)

---
updated-dependencies:
- dependency-name: google-auth
  dependency-version: 2.53.0
  dependency-type: direct:production
...

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backend/pyproject.toml

@@ -77,7 +77,7 @@ dependencies = [
     "pillow==10.4.0",
     "redis[hiredis]==5.0.2",
     "google-api-python-client<3.0.0,>=2.94.0",
-    "google-auth<3.0.0,>=2.22.0",
+    "google-auth>=2.53.0,<3.0.0",
     "argon2-cffi<24.0.0,>=23.1.0",
     "stripe==10.5.0",
     "djangorestframework==3.17.1",