build(deps): bump google-cloud-storage in /examples/ruby (#1581)

Bumps [google-cloud-storage](https://github.com/googleapis/google-cloud-ruby) from 1.50.0 to 1.51.0.
- [Release notes](https://github.com/googleapis/google-cloud-ruby/releases)
- [Changelog](https://github.com/googleapis/google-cloud-ruby/blob/main/google-cloud-document_ai-v1beta3/CHANGELOG.md)
- [Commits](googleapis/google-cloud-ruby@google-cloud-storage/v1.50.0...google-cloud-storage/v1.51.0)

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

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examples/ruby/Gemfile.lock

@@ -29,7 +29,7 @@ GEM
     google-cloud-env (2.1.1)
       faraday (>= 1.0, < 3.a)
     google-cloud-errors (1.4.0)
-    google-cloud-storage (1.50.0)
+    google-cloud-storage (1.51.0)
       addressable (~> 2.8)
       digest-crc (~> 0.4)
       google-apis-core (~> 0.13)