Bump grpcio from 1.20.1 to 1.53.0 in /tools/harness-simulation/harness (#9257)

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](https://github.com/grpc/grpc/compare/v1.20.1...v1.53.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/tools/harness-simulation/harness/requirements.txt b/tools/harness-simulation/harness/requirements.txt
index 179c044..73fba92 100644
--- a/tools/harness-simulation/harness/requirements.txt
+++ b/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