Use #[expect(lint)] over #[allow(lint)] where possible (#17822)

crates/ruff_cache/tests/cache_key.rs

@@ -47,7 +47,7 @@ fn struct_ignored_fields() {
     struct NamedFieldsStruct {
         a: String,
         #[cache_key(ignore)]
-        #[allow(unused)]
+        #[expect(unused)]
         b: String,
     }