chore: bump protobuf in /python in the pip group across 1 directory (#1401)

Bumps the pip group with 1 update in the /python directory: [protobuf](https://github.com/protocolbuffers/protobuf).


Updates `protobuf` from 5.29.5 to 5.29.6
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 5.29.6
  dependency-type: indirect
  dependency-group: pip
...

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