Migrate to cargo_embargo. am: b8374cfeae

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/idna/+/2822155

Change-Id: I3eb2958e52532856c54a4a98995a60902fe5e465
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>