Migrate to cargo_embargo. am: dcfeb4c7cc am: 62eb4c6da1

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/webpki/+/2836735

Change-Id: I526da152675defe389ef1fc49630e11276c314bd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>