build(deps): bump google-protobuf in /examples/grpc_clients/ruby_client

Bumps [google-protobuf](https://github.com/protocolbuffers/protobuf) from 3.9.0.rc.1 to 3.19.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/commits/v3.19.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

examples/grpc_clients/ruby_client/Gemfile.lock

@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    google-protobuf (3.9.0.rc.1)
-    google-protobuf (3.9.0.rc.1-x86_64-linux)
+    google-protobuf (3.19.3)
+    google-protobuf (3.19.3-x86_64-linux)
     googleapis-common-protos-types (1.0.4)
       google-protobuf (~> 3.0)
     grpc (1.20.0)