Merge "Mark apex-available" into main am: 39b3428d38

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/grpcio-sys/+/3165535

Change-Id: I9cb7f4e468e2b12e2771eb44393bccabbdf474ec
Signed-off-by: Automerger Merge Worker <[email protected]>