Bump grpcio from 1.27.2 to 1.53.2 in /res/TensorFlowPythonExamples

Bumps [grpcio](https://github.com/grpc/grpc) from 1.27.2 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@v1.27.2...v1.53.2)

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

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

res/TensorFlowPythonExamples/requirements.txt

@@ -1,7 +1,7 @@
 absl-py==0.9.0
 astor==0.8.1
 gast==0.3.3
-grpcio==1.27.2
+grpcio==1.53.2
 h5py==2.10.0
 Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0