Bump types-protobuf from 3.20.4.5 to 4.21.0.0 (#460)

Bumps [types-protobuf](https://github.com/python/typeshed) from 3.20.4.5 to 4.21.0.0.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

test_requirements.txt

@@ -4,4 +4,4 @@ protobuf==4.21.9
 pytest==7.2.0
 grpc-stubs==1.24.11
 grpcio-tools==1.50.0
-types-protobuf==3.20.4.5
+types-protobuf==4.21.0.0