Bump protobuf from 6.32.1 to 6.33.1

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 6.32.1 to 6.33.1.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 6.33.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

test_requirements.txt

@@ -1,6 +1,6 @@
 # Requirements to run unit tests. Tests import from
 # generated code.
-protobuf==6.32.1
+protobuf==6.33.1
 pytest==8.4.2
 pytest-asyncio==0.24.0
 grpc-stubs==1.53.0.5