fix clippy absolute paths warning

Author: davidzeng0

serde_derive/src/dummy.rs

@@ -14,7 +14,7 @@ pub fn wrap_in_const(serde_path: Option<&syn::Path>, code: TokenStream) -> Token
 
     quote! {
         #[doc(hidden)]
-        #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
+        #[allow(non_upper_case_globals, unused_attributes, unused_qualifications, clippy::absolute_paths)]
         const _: () = {
             #use_serde
             #code