Update TEST_MAPPING am: 74ed0f6c3f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/libloading/+/2107520

Change-Id: I31c62d527195f0bf472e1d213cf72c91df6435c2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>