Rollup merge of #137109 - bend-n:knife, r=oli-obk

stabilize extract_if

Tracking issue: #43244
Closes: #43244
FCP completed: rust-lang/rust#43244 (comment)

Author: tgross35

src/lib.rs

@@ -15,7 +15,6 @@
 #![feature(unqualified_local_imports)]
 #![feature(derive_coerce_pointee)]
 #![feature(arbitrary_self_types)]
-#![feature(extract_if)]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,