Build: Bump protobuf from 5.29.5 to 6.32.1

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 5.29.5 to 6.32.1.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 6.32.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]