Bump google-cloud-pubsub in /docker/google-cloud-storage (#32853)

Bumps [google-cloud-pubsub](https://github.com/googleapis/python-pubsub) from 2.23.1 to 2.25.1.
- [Release notes](https://github.com/googleapis/python-pubsub/releases)
- [Changelog](https://github.com/googleapis/python-pubsub/blob/main/CHANGELOG.md)
- [Commits](googleapis/python-pubsub@v2.23.1...v2.25.1)

---
updated-dependencies:
- dependency-name: google-cloud-pubsub
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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