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

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

packages/stream_chat_flutter/lib/src/channel_avatar.dart

@@ -52,7 +52,7 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 class ChannelAvatar extends StatelessWidget {
   /// Instantiate a new ChannelImage
   const ChannelAvatar({
-    Key? key,
+    super.key,
     this.channel,
     this.constraints,
     this.onTap,
@@ -60,7 +60,7 @@ class ChannelAvatar extends StatelessWidget {
     this.selected = false,
     this.selectionColor,
     this.selectionThickness = 4,
-  }) : super(key: key);
+  });
 
   /// [BorderRadius] to display the widget
   final BorderRadius? borderRadius;