Bump grpcio from 0.12.1 to 0.13.0 in /rust_grpcio_bench

Bumps [grpcio](https://github.com/tikv/grpc-rs) from 0.12.1 to 0.13.0.
- [Release notes](https://github.com/tikv/grpc-rs/releases)
- [Changelog](https://github.com/tikv/grpc-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tikv/grpc-rs/commits/v0.13.0)

---
updated-dependencies:
- dependency-name: grpcio
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

rust_grpcio_bench/Cargo.lock

@@ -11,7 +11,7 @@ lto = true
 
 [dependencies]
 jemallocator = "0.5.0"
-grpcio = "0.12"
+grpcio = "0.13"
 protobuf = "2"
 futures = "0.3"