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

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

Change-Id: I3bd2f188e43c6a0b1d1d2ecf48796eea21b750fe