Upgrade rust/crates/async-trait to 0.1.51 am: aa9cbeb7d8 am: 5f7f810f74 am: 7bb5d193ed am: 0b9ad6d61e am: d7e7952581

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

Change-Id: I3e30406f8e533780e93bf97776011f023a130bdc