fix analysis issues

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

packages/stream_chat_flutter/example/lib/main.dart

@@ -177,7 +177,7 @@ class _SplitViewState extends State<SplitView> {
                   : Center(
                       child: Text(
                         'Pick a channel to show the messages 💬',
-                        style: Theme.of(context).textTheme.headline5,
+                        style: Theme.of(context).textTheme.headlineSmall,
                       ),
                     ),
             ),

packages/stream_chat_flutter/example/lib/split_view.dart

@@ -78,7 +78,7 @@ class _SplitViewState extends State<SplitView> {
                 : Center(
                     child: Text(
                       'Pick a channel to show the messages 💬',
-                      style: Theme.of(context).textTheme.headline5,
+                      style: Theme.of(context).textTheme.headlineSmall,
                     ),
                   ),
           ),