deps: Update grpc to 1.60.1
Updates the grpc package to the latest available. The import path for
the grpc_testing package had changed and so required a manual MR.
Original Renovate MR: !6588 (closed)
Edited by James Liu
Updates the grpc package to the latest available. The import path for
the grpc_testing package had changed and so required a manual MR.
Original Renovate MR: !6588 (closed)