Migrate to cargo_embargo. am: a67d260523

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bencher/+/2797709

Change-Id: I39715d6c82dadd8cfa083db02fb8b763fd93c10c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>