Migrate to cargo_embargo. am: b8374cfeae am: e3ca407806 am: 2a3de09c12

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

Change-Id: I5d0b85970980e813df3b83829f67b7f035377dc0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>