Update crate source to work with Rust 1.66.1 am: b6a60db484 am: 54c5fe172a

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/untrusted/+/2431193

Change-Id: I0ca1716d9f203dff43576b0f1c0d4ce2b31fcc24
Signed-off-by: Automerger Merge Worker <[email protected]>