Tune up lints for 1.81 Rust

Author: tyranron

Diff for: src/lib.rs

@@ -38,6 +38,7 @@
     html_favicon_url = "https://avatars.githubusercontent.com/u/91469139?s=256"
 )]
 #![forbid(non_ascii_idents, unsafe_code)]
+#![warn(clippy::allow_attributes, clippy::allow_attributes_without_reason)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
 #[cfg(feature = "parser")]

Diff for: src/parser.rs

@@ -530,7 +530,6 @@ pub(crate) rule feature() -> Feature
       r:rules() pb:position!()
       nl()*
     {?
-        #[allow(clippy::question_mark)]
         if let Err(e) = env.assert_no_error() {
             Err(e)
         } else {