chore(deps): bump grpcio in /backend/python/common/template

Bumps [grpcio](https://github.com/grpc/grpc) from 1.71.0 to 1.73.1.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.71.0...v1.73.1)

---
updated-dependencies:
- dependency-name: grpcio
  dependency-version: 1.73.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/python/common/template/requirements.txt

@@ -1,3 +1,3 @@
-grpcio==1.71.0
+grpcio==1.73.1
 protobuf
 grpcio-tools