Migrate to cargo_embargo. am: 128f7c3e2f am: c0506a84a5

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

Change-Id: Ia0922220cdca2326cf0896b74febe0a67042a6fe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>