refactor(macos): migrate to objc2

src/wkwebview/mod.rs

@@ -639,7 +639,7 @@ r#"Object.defineProperty(window, 'ipc', {
       let store = config.websiteDataStore();
       let all_data_types = WKWebsiteDataStore::allWebsiteDataTypes();
       let date = NSDate::dateWithTimeIntervalSince1970(0.0);
-      let handler = block2::RcBlock::new(|| {});
+      let handler = block2::RcBlock::new(|| {}).copy();
       store.removeDataOfTypes_modifiedSince_completionHandler(&all_data_types, &date, &handler);
     }
     Ok(())