Bump mypy-protobuf from 1.18 to 1.19
Bump mypy-protobuf from 1.18 to 1.19

Bumps [mypy-protobuf](https://github.com/dropbox/mypy-protobuf) from 1.18 to 1.19.
- [Release notes](https://github.com/dropbox/mypy-protobuf/releases)
- [Commits](https://github.com/dropbox/mypy-protobuf/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
postlund/pyatv,postlund/pyatv