build(deps): bump grpcio in /benchmarks/rnn-serving/python

Bumps [grpcio](https://github.com/grpc/grpc) from 1.45.0 to 1.53.2.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.45.0...v1.53.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

benchmarks/rnn-serving/python/requirements.txt

@@ -1,6 +1,6 @@
 numpy
 torch
-grpcio==1.45.0
+grpcio==1.53.2
 grpcio-tools==1.45.0
 opentelemetry-api==1.3.0
 opentelemetry-exporter-zipkin==1.3.0