fixup! Rust 1.72 compat

Author: marcan

rust/alloc/lib.rs

@@ -106,6 +106,7 @@
 #![feature(ascii_char)]
 #![feature(assert_matches)]
 #![feature(async_iterator)]
+#![feature(cfg_version)]
 #![feature(coerce_unsized)]
 #![feature(const_align_of_val)]
 #![feature(const_box)]