Update grpcio requirement from <1.66.0,>=1.56.2 to >=1.56.2,<1.69.0

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@v1.56.2...v1.68.1)

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

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

setup.py

@@ -85,7 +85,7 @@ def run(self):
         'flatten_json',
         'tensorboardX',
         'protobuf>=4.22,<6.0.0',
-        'grpcio>=1.56.2,<1.66.0',
+        'grpcio>=1.56.2,<1.69.0',
     ],
     python_requires='>=3.8, <3.12',
     project_urls={