Merge "Mark apex-available" into main am: bcf6ac8da0

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures/+/3166947

Change-Id: Ib2ec6cbd2e97ba350a67395cb9a5e651a78e0b14
Signed-off-by: Automerger Merge Worker <[email protected]>