Merge "Upgrade grpcio-compiler to 0.12.1" into main am: 8f5c92c714

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/grpcio-compiler/+/2664079

Change-Id: I5df5a2348c816e56e4cd60f978f2739829c41531
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>