Bump grpcio from 1.29.0 to 1.53.2

Bumps [grpcio](https://github.com/grpc/grpc) from 1.29.0 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@v1.29.0...v1.53.2)

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

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

Author: dependabot[bot]

requirements.txt

@@ -6,7 +6,7 @@ cycler==0.10.0
 decorator==4.4.2
 gast==0.2.2
 google-pasta==0.2.0
-grpcio==1.29.0
+grpcio==1.53.2
 h5py==2.10.0
 idna==2.9
 imageio==2.8.0