Upgrade rust/crates/async-trait to 0.1.42

Test: make
Change-Id: I59704fdd852efc7dc64f6cf733093632653b0313
diff --git a/src/lib.rs b/src/lib.rs
index f0102d8..929af4f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -303,6 +303,8 @@
 //! let object = &value as &dyn ObjectSafe;
 //! ```
 
+#![allow(clippy::match_like_matches_macro)] // matches! requires Rust 1.42
+
 extern crate proc_macro;
 
 mod args;