Bump protobuf from 3.19.4 to 5.29.6

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.19.4 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: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1 +1 @@
-protobuf==3.19.4
+protobuf==5.29.6