Migrate to cargo_embargo. am: e69b1970fd

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pest/+/2822119

Change-Id: Idfaed29619edeb838e32ab9a8f0403120cea84bc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>