Migrate to cargo_embargo. am: 064020b2df am: 73c9fa1c04 am: 4f48d6d243

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/instant/+/2822156

Change-Id: Ic5b89b4946f62688bd2fed9bba0c47b55fcffa7c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>