Rollup merge of rust-lang#90521 - jhpratt:stabilize-destructuring_assignment, r=jackh726,pnkfelix

Stabilize `destructuring_assignment`

Closes rust-lang#71126

- [Stabilization report](rust-lang#71126 (comment))
- [Completed FCP](rust-lang#71126 (comment))

`@rustbot` label +F-destructuring-assignment +T-lang
Also needs +relnotes but I don't have permission to add that tag.

Author: matthiaskrgr

alloc/src/lib.rs

@@ -136,7 +136,7 @@
 #![feature(cfg_target_has_atomic)]
 #![feature(const_fn_trait_bound)]
 #![feature(const_trait_impl)]
-#![feature(destructuring_assignment)]
+#![cfg_attr(bootstrap, feature(destructuring_assignment))]
 #![feature(dropck_eyepatch)]
 #![feature(exclusive_range_pattern)]
 #![feature(fundamental)]