Bump grpc.version from 1.18.0 to 1.19.0
Bump grpc.version from 1.18.0 to 1.19.0

Bumps `grpc.version` from 1.18.0 to 1.19.0.

Updates `grpc-netty` from 1.18.0 to 1.19.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](https://github.com/grpc/grpc-java/compare/v1.18.0...v1.19.0)

Updates `grpc-protobuf` from 1.18.0 to 1.19.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](https://github.com/grpc/grpc-java/compare/v1.18.0...v1.19.0)

Updates `grpc-stub` from 1.18.0 to 1.19.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](https://github.com/grpc/grpc-java/compare/v1.18.0...v1.19.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
uweschaefer/factcast,uweschaefer/factcast,uweschaefer/factcast