Merge "Upgrade rust/crates/futures-macro to 0.3.12" am: 401b386756 am: fd55e57342 am: 611dab61d8 am: eba6d1f0ab

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-macro/+/1582317

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie5125351171beebafbf7b6d8113cb305e7cdf724