Bump google-protobuf in /getting-started-guides/ruby (#677)

Bumps [google-protobuf](https://github.com/protocolbuffers/protobuf) from 3.23.3 to 3.25.5.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.23.3...v3.25.5)

---
updated-dependencies:
- dependency-name: google-protobuf
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

getting-started-guides/ruby/Gemfile.lock

@@ -3,9 +3,9 @@ GEM
   specs:
     daemons (1.4.1)
     eventmachine (1.2.7)
-    google-protobuf (3.23.3-arm64-darwin)
-    google-protobuf (3.23.3-x86_64-darwin)
-    google-protobuf (3.23.3-x86_64-linux)
+    google-protobuf (3.25.5-arm64-darwin)
+    google-protobuf (3.25.5-x86_64-darwin)
+    google-protobuf (3.25.5-x86_64-linux)
     googleapis-common-protos-types (1.6.0)
       google-protobuf (~> 3.14)
     mustermann (3.0.0)