requirements: update grpcio requirement from <1.69.0 to <1.70.0

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...v1.69.0)

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

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

requirements.txt

@@ -3,7 +3,7 @@ dill<0.3.10
 fastkde>=2.0.0, <2.0.2
 graph-scheduler>=1.2.1, <1.3.0
 graphviz<0.21.0
-grpcio<1.69.0
+grpcio<1.70.0
 leabra-psyneulink<0.3.3
 llvmlite<0.44
 matplotlib<3.7.6