Update TEST_MAPPING am: e899c8c6c4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-macro/+/2399355

Change-Id: Ied6b20a77d5e755b8c44ba4e31286dbde2978029
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>