Migrate to cargo_embargo. am: db112fb0d2 am: e005aad62f

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

Change-Id: I4a443180db5a7c600763155136c1693217b64e4b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>