Migrate to cargo_embargo. am: e0fa966410 am: 9537b47e45

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/combine/+/2826452

Change-Id: I79c67f56005079e29a2a8fd71c9aa876d834da13
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>