Update TEST_MAPPING am: 4ac1d78d69 am: a7a3676ac5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/either/+/2107317

Change-Id: Ib394a615366c38897ae65e7e412bbaf14a0b035f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>