Upgrade futures-macro to 0.3.28 am: 96009b4e62

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-macro/+/2520196

Change-Id: I781d7597ed9de57f6d729daf237c5ef1802ce2b1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>