Update name of type alias impl trait feature in nightly

    error[E0658]: `impl Trait` in type aliases is unstable
        --> tests/test.rs:1297:22
         |
    1297 |         type Assoc = impl Sized;
         |                      ^^^^^^^^^^
         |
         = note: see issue #63063 <rust-lang/rust#63063> for more information
         = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable

    warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
     --> tests/test.rs:3:33
      |
    3 |     feature(min_specialization, type_alias_impl_trait)
      |                                 ^^^^^^^^^^^^^^^^^^^^^
      |
      = note: `#[warn(incomplete_features)]` on by default
      = note: see issue #63063 <rust-lang/rust#63063> for more information

Author: dtolnay

tests/test.rs

@@ -1,6 +1,6 @@
 #![cfg_attr(
     async_trait_nightly_testing,
-    feature(min_specialization, type_alias_impl_trait)
+    feature(min_specialization, min_type_alias_impl_trait)
 )]
 #![allow(
     clippy::let_underscore_drop,