Bump mypy-protobuf from 1.18 to 3.5.0 in /sdks/python

Bumps [mypy-protobuf](https://github.com/nipunn1313/mypy-protobuf) from 1.18 to 3.5.0.
- [Changelog](https://github.com/nipunn1313/mypy-protobuf/blob/main/CHANGELOG.md)
- [Commits](nipunn1313/mypy-protobuf@v1.18...v3.5.0)

---
updated-dependencies:
- dependency-name: mypy-protobuf
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

sdks/python/build-requirements.txt

@@ -21,7 +21,7 @@ setuptools
 wheel>=0.36.0
 
 grpcio-tools==1.37.0
-mypy-protobuf==1.18
+mypy-protobuf==3.5.0
 
 # Avoid https://github.com/pypa/virtualenv/issues/2006
 distlib==0.3.1