Auto merge of #81047 - glittershark:stabilize-cmp-min-max-by, r=kodraus

Stabilize cmp_min_max_by

I would like to propose cmp::{min_by, min_by_key, max_by, max_by_key}
for stabilization.

These are relatively simple and seemingly uncontroversial functions and
have been unchanged in unstable for a while now.

Closes: #64460

compiler/rustc_middle/src/lib.rs

@@ -29,7 +29,6 @@
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
-#![feature(cmp_min_max_by)]
 #![feature(const_fn)]
 #![feature(const_panic)]
 #![feature(core_intrinsics)]