chore(deps): bump google-protobuf in /fluent-plugin-protobuf

Bumps [google-protobuf](https://github.com/protocolbuffers/protobuf) from 3.25.2 to 3.25.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.25.2...v3.25.3)

---
updated-dependencies:
- dependency-name: google-protobuf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

fluent-plugin-protobuf/Gemfile.lock

@@ -23,7 +23,7 @@ GEM
       tzinfo-data (~> 1.0)
       webrick (~> 1.4)
       yajl-ruby (~> 1.0)
-    google-protobuf (3.25.2)
+    google-protobuf (3.25.3)
     http_parser.rb (0.8.0)
     msgpack (1.6.0)
     power_assert (2.0.3)