update cfg(bootstrap)s

pietroalbini · pietroalbini · commit a7cbca1c32e8 · 2023-12-22T11:14:11.000+01:00
diff --git a/src/lib.rs b/src/lib.rs
@@ -11,7 +11,6 @@
 #![feature(round_ties_even)]
 #![feature(let_chains)]
 #![feature(lint_reasons)]
-#![cfg_attr(bootstrap, feature(trait_upcasting))]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,
