Migrate to cargo_embargo. am: c82ca0ec5e am: f64ec43c07 am: 2a28308d33

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/octets/+/2824490

Change-Id: I7048524ff668cbb7d384c0a4b65e0094e25df18d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>