Migrate to cargo_embargo. am: 425d2c3bfe am: 32668e3a3e am: 14ffd5abfd

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/weak-table/+/2824523

Change-Id: I49d8ca4962cf1573832f45d36dbd20b3727cc389
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>