CI fix for Rust 1.75 (rustwasm#3761)

* fix wat output file

* cargo clippy --no-deps --all-features -p wasm-bindgen-macro-support --fix -- -D warnings

* add #[allow(unused_imports)] for the binding file in web-sys

crates/cli/tests/reference/anyref-import-catch.wat

@@ -5,8 +5,8 @@
   (type (;3;) (func (param i32) (result i32)))
   (import "./reference_test_bg.js" "__wbindgen_init_externref_table" (func (;0;) (type 0)))
   (func $__wbindgen_exn_store (;1;) (type 2) (param i32))
-  (func $exported (;2;) (type 2) (param i32))
-  (func $__externref_table_dealloc (;3;) (type 2) (param i32))
+  (func $__externref_table_dealloc (;2;) (type 2) (param i32))
+  (func $exported (;3;) (type 2) (param i32))
   (func $__externref_table_alloc (;4;) (type 1) (result i32))
   (func $__wbindgen_add_to_stack_pointer (;5;) (type 3) (param i32) (result i32))
   (table (;0;) 128 externref)

crates/macro-support/src/parser.rs

@@ -525,7 +525,7 @@ impl<'a> ConvertToAst<(&ast::Program, BindgenAttrs, &'a Option<ast::ImportModule
         let operation_kind = operation_kind(&opts);
 
         let kind = if opts.method().is_some() {
-            let class = wasm.arguments.get(0).ok_or_else(|| {
+            let class = wasm.arguments.first().ok_or_else(|| {
                 err_span!(self, "imported methods must have at least one argument")
             })?;
             let class = match get_ty(&class.ty) {