Migrate to cargo_embargo. am: e8e520b2d4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rustversion/+/2828052

Change-Id: I38b4ba184e3e3694dcaceafc3387567e95a42e93
Signed-off-by: Automerger Merge Worker <[email protected]>