Migrate to cargo_embargo. am: db112fb0d2

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

Change-Id: I9f099a37f940f6cef50f6645b5e7b1435ccf6112
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>