Bump google-cloud-storage from 0.15.0 to 0.23.0 (#505)

Bumps [google-cloud-storage](https://github.com/yoshidan/google-cloud-rust) from 0.15.0 to 0.23.0.
- [Release notes](https://github.com/yoshidan/google-cloud-rust/releases)
- [Commits](https://github.com/yoshidan/google-cloud-rust/commits)

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

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