Update TEST_MAPPING am: 6cc673e97d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/unicode-normalization/+/2108468

Change-Id: If54cf5e5fcd27e7c670bfb564005b9369c53c1e4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>