Replace async_trait with AFIT / RPITIT (#2308)

Co-authored-by: Jonas Platte <[email protected]>

examples/jwt/src/main.rs

@@ -7,7 +7,6 @@
 //! ```
 
 use axum::{
-    async_trait,
     extract::FromRequestParts,
     http::{request::Parts, StatusCode},
     response::{IntoResponse, Response},
@@ -122,7 +121,6 @@ impl AuthBody {
     }
 }
 
-#[async_trait]
 impl<S> FromRequestParts<S> for Claims
 where
     S: Send + Sync,