Migrate to cargo_embargo. am: b6e9f2e4a4 am: 85c1995fc7 am: 1cf29d9178

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/regex-syntax/+/2821942

Change-Id: Id678671e67a3d49637b4479a1a0252c5a27c36c0
Signed-off-by: Automerger Merge Worker <[email protected]>