Update TEST_MAPPING am: f3a944a7f9 am: a3fefcaa7d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures/+/2108489

Change-Id: Ibf02a50dd5dffcf477825c5f81ed86590e354628
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>