Bump grpcio from 1.68.1 to 1.73.0

Bumps [grpcio](https://github.com/grpc/grpc) from 1.68.1 to 1.73.0.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.68.1...v1.73.0)

---
updated-dependencies:
- dependency-name: grpcio
  dependency-version: 1.73.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,3 +1,3 @@
 pygame~=2.6.1
-grpcio==1.68.1
+grpcio==1.73.0
 protobuf==6.31.1