requirements: update grpcio requirement from <1.56.0 to <1.57.0

Updates the requirements on [grpcio](https://github.com/grpc/grpc) to permit the latest version.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v0.15.0...v1.56.0)

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

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

requirements.txt

@@ -4,7 +4,7 @@ dill<0.3.7
 fastkde>=1.0.24, <1.0.25
 graph-scheduler>=0.2.0, <1.1.3
 graphviz<0.21.0
-grpcio<1.56.0
+grpcio<1.57.0
 leabra-psyneulink<0.3.3
 llvmlite<0.41
 matplotlib<3.7.2