build(deps): bump protobuf from 6.33.4 to 6.33.5 in /requirements

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 6.33.4 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: direct:production
...

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

Author: dependabot[bot]

requirements/edx-platform-constraints.txt

@@ -868,7 +868,7 @@ proto-plus==1.27.0
     # via
     #   google-api-core
     #   google-cloud-firestore
-protobuf==6.33.4
+protobuf==6.33.5
     # via
     #   google-api-core
     #   google-cloud-firestore