Rollup merge of rust-lang#129312 - tbu-:pr_str_not_impl_error, r=Noratrieb

Fix stability attribute of `impl !Error for &str`

It was introduced in bf7611d (rust-lang#99917), which was included in Rust 1.65.0.

Author: matthiaskrgr

library/core/src/str/mod.rs

@@ -2818,5 +2818,5 @@ impl_fn_for_zst! {
 }
 
 // This is required to make `impl From<&str> for Box<dyn Error>` and `impl<E> From<E> for Box<dyn Error>` not overlap.
-#[stable(feature = "rust1", since = "1.0.0")]
+#[stable(feature = "error_in_core_neg_impl", since = "1.65.0")]
 impl !crate::error::Error for &str {}