Migrate to cargo_embargo. am: a67d260523 am: c493d58588 am: 369ab1d15e

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

Change-Id: I2fa71091fdce0f0aa0341cebd8a792f9daa0e312
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>