chore(deps): bump protobuf from 5.29.4 to 5.29.5 in /gemma2 (#13434)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 5.29.4 to 5.29.5.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v5.29.4...v5.29.5)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 5.29.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

gemma2/requirements.txt

@@ -1,2 +1,2 @@
 google-cloud-aiplatform[all]==1.64.0
-protobuf==5.29.4
+protobuf==5.29.5