Migrate to cargo_embargo. am: 147d7ea1fc

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/codespan-reporting/+/2822238

Change-Id: Iebaa6bf8e74b9fdad139dcd56b57655bb076a00f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>