Bumps the python group in /tests with 4 updates: [certifi](https:/certifi/python-certifi), [grpcio](https:/grpc/grpc), [grpcio-tools](https:/grpc/grpc) and [protobuf](https:/protocolbuffers/protobuf).


Updates `certifi` from 2024.7.4 to 2024.8.30
- [Commits](certifi/python-certifi@2024.07.04...2024.08.30)

Updates `grpcio` from 1.66.0 to 1.66.1
- [Release notes](https:/grpc/grpc/releases)
- [Changelog](https:/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.66.0...v1.66.1)

Updates `grpcio-tools` from 1.66.0 to 1.66.1
- [Release notes](https:/grpc/grpc/releases)
- [Changelog](https:/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.66.0...v1.66.1)

Updates `protobuf` from 5.27.3 to 5.28.0
- [Release notes](https:/protocolbuffers/protobuf/releases)
- [Changelog](https:/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v5.27.3...v5.28.0)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python
- dependency-name: grpcio
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python
- dependency-name: grpcio-tools
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python
- dependency-name: protobuf
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python
...

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