Bump grpcio from 1.20.1 to 1.53.0 in /tools/harness-simulation/harness

Bumps [grpcio](https://github.com/grpc/grpc) from 1.20.1 to 1.53.0.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.20.1...v1.53.0)

---
updated-dependencies:
- dependency-name: grpcio
  dependency-type: direct:production
...

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

tools/harness-simulation/harness/requirements.txt

@@ -1,3 +1,3 @@
-grpcio==1.20.1
+grpcio==1.53.0
 grpcio-tools==1.20.1
 PyYAML==5.4.1