Bump protobuf from 5.29.4 to 5.29.5 in /genai

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
...

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

Author: dependabot[bot]

genai/requirements.txt

@@ -25,7 +25,7 @@ markupsafe==3.0.2
 mdurl==0.1.2
 packaging==25.0
 pluggy==1.5.0
-protobuf==5.29.4
+protobuf==5.29.5
 pycparser==2.22
 pydantic==2.11.4
 pydantic-core==2.33.2