Bump protobuf from 4.25.8 to 5.29.6 in /playground/infrastructure

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 4.25.8 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]

playground/infrastructure/requirements.txt

@@ -24,7 +24,7 @@ tqdm~=4.62.3
 sonora==0.2.2
 pydantic==1.10.13
 grpcio-tools==1.62.1
-protobuf==4.25.8
+protobuf==5.29.6
 google-cloud-datastore==2.11.0
 
 requests~=2.28.2