Update rust version and update tests.

rust-version

@@ -1 +1 @@
-120b2a704a60d4341286bd82f6e638c65ca169b6
+6a388dcfbb07b3ca3d4ad3fd3902ac7e3b11b5f6

tests/run-pass/async-fn.rs

@@ -1,5 +1,4 @@
 #![feature(never_type)]
-#![feature(wake_trait)]
 
 use std::{future::Future, pin::Pin, task::Poll};
 use std::task::{Wake, Waker, Context};

tests/run-pass/panic/catch_panic.rs

@@ -3,7 +3,7 @@
 // We test the `align_offset` panic below, make sure we test the interpreter impl and not the "real" one.
 // compile-flags: -Zmiri-symbolic-alignment-check
 #![feature(never_type)]
-#![allow(unconditional_panic)]
+#![allow(unconditional_panic, non_fmt_panic)]
 
 use std::panic::{catch_unwind, AssertUnwindSafe};
 use std::cell::Cell;