Upgrade rust/crates/async-trait to 0.1.51 am: aa9cbeb7d8 am: 5f7f810f74

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-trait/+/1790987

Change-Id: Ie2a2e6cb3c6f52c633592b56d08078d62f3c6193