update async_trait: 0.1.71 -> 0.1.86

Summary: From what I can see, it only expands the scope of application for the annotation and addresses lint when necessary: https://github.com/dtolnay/async-trait/releases

Reviewed By: dtolnay

Differential Revision: D70059233

fbshipit-source-id: 954a174a1e2fcca3dddd6228340df8d12a8eed9a