chore: Catch no_std problems earlier

Author: epage

crates/anstyle/src/lib.rs

@@ -47,6 +47,8 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #![warn(missing_docs)]
+#![warn(clippy::std_instead_of_core)]
+#![warn(clippy::std_instead_of_alloc)]
 #![warn(clippy::print_stderr)]
 #![warn(clippy::print_stdout)]