Migrate to cargo_embargo. am: ca1db9f032

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/thiserror-impl/+/2833292

Change-Id: I2ae51a74a8a18503db76e258187355a5ac0fcbe5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>