Migrate to cargo_embargo. am: edbc0e515f am: fe05080cad am: 5081500c76

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/serde/+/2828150

Change-Id: I097243711d2271dfd9bd4d919ca6990889769ad5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>