Rollup merge of rust-lang#91755 - not-my-profile:fix-const_linked_list_new-since, r=dtolnay

Fix since attribute for const_linked_list_new feature

rust-lang#63684
was merged for 1.39 not 1.32

Author: matthiaskrgr

library/alloc/src/collections/linked_list.rs

@@ -417,7 +417,7 @@ impl<T> LinkedList<T> {
     /// let list: LinkedList<u32> = LinkedList::new();
     /// ```
     #[inline]
-    #[rustc_const_stable(feature = "const_linked_list_new", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_linked_list_new", since = "1.39.0")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[must_use]
     pub const fn new() -> Self {