Migrate to cargo_embargo. am: d051a08333 am: d440b696f3

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pest_derive/+/2821938

Change-Id: I43b58c6636a2b12220fe1767c4733c113fd95aea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>