chore(repo): add lints, update freezed, json_serializable

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat_flutter/lib/src/user_mention_tile.dart

@@ -14,12 +14,12 @@ class StreamUserMentionTile extends StatelessWidget {
   /// Constructor for creating a [StreamUserMentionTile] widget
   const StreamUserMentionTile(
     this.user, {
-    Key? key,
+    super.key,
     this.title,
     this.subtitle,
     this.leading,
     this.trailing,
-  }) : super(key: key);
+  });
 
   /// User to display in the tile
   final User user;