Migrate to cargo_embargo. am: 128f7c3e2f am: c0506a84a5 am: 277701638d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/toml_datetime/+/2828055

Change-Id: Ic1d2f62bb4f114851d080ac6e7488216c2d6427a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>