Bump protobuf in /sample-apps/django-postgres-gunicorn

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 5.29.3 to 7.34.0rc1.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 7.34.0rc1
  dependency-type: indirect
...

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