Bump protobuf from 5.29.3 to 6.33.5 in /example

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 5.29.3 to 6.33.5.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 6.33.5
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]