Migrate to cargo_embargo. am: db112fb0d2 am: b164c86232

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/percent-encoding/+/2829798

Change-Id: I4c2dbae89d3b42c588c294f9c0c5f771f1f4b7cb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>