Bump protobuf from 3.19.1 to 3.19.5 in /cmd/suggestion/optuna/v1beta1 (…

…#1964)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.19.1 to 3.19.5.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.19.1...v3.19.5)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
...

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

cmd/suggestion/optuna/v1beta1/requirements.txt

@@ -1,4 +1,4 @@
 grpcio==1.41.1
-protobuf==3.19.1
+protobuf==3.19.5
 googleapis-common-protos==1.53.0
 optuna>=3.0.0