chore: update package lints and apply fixes

packages/stream_chat_v1/lib/pages/pinned_messages_screen.dart

@@ -6,6 +6,8 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 import 'channel_page.dart';
 
 class PinnedMessagesScreen extends StatefulWidget {
+  const PinnedMessagesScreen({super.key});
+
   @override
   State<PinnedMessagesScreen> createState() => _PinnedMessagesScreenState();
 }
@@ -22,7 +24,7 @@ class _PinnedMessagesScreenState extends State<PinnedMessagesScreen> {
       true,
     ),
     sort: [
-      SortOption(
+      const SortOption(
         'created_at',
         direction: SortOption.ASC,
       ),
@@ -44,7 +46,7 @@ class _PinnedMessagesScreenState extends State<PinnedMessagesScreen> {
             fontSize: 16.0,
           ),
         ),
-        leading: StreamBackButton(),
+        leading: const StreamBackButton(),
         backgroundColor: StreamChatTheme.of(context).colorTheme.barsBg,
       ),
       body: StreamMessageSearchListView(
@@ -58,7 +60,7 @@ class _PinnedMessagesScreenState extends State<PinnedMessagesScreen> {
                   size: 136.0,
                   color: StreamChatTheme.of(context).colorTheme.disabled,
                 ),
-                SizedBox(height: 16.0),
+                const SizedBox(height: 16.0),
                 Text(
                   AppLocalizations.of(context).noPinnedItems,
                   style: TextStyle(
@@ -68,7 +70,7 @@ class _PinnedMessagesScreenState extends State<PinnedMessagesScreen> {
                     fontWeight: FontWeight.bold,
                   ),
                 ),
-                SizedBox(height: 8.0),
+                const SizedBox(height: 8.0),
                 RichText(
                   textAlign: TextAlign.center,
                   text: TextSpan(children: [
@@ -101,6 +103,7 @@ class _PinnedMessagesScreenState extends State<PinnedMessagesScreen> {
         },
         onMessageTap: (messageResponse) async {
           final client = StreamChat.of(context).client;
+          final navigator = Navigator.of(context);
           final message = messageResponse.message;
           final channel = client.channel(
             messageResponse.channel!.type,
@@ -109,8 +112,7 @@ class _PinnedMessagesScreenState extends State<PinnedMessagesScreen> {
           if (channel.state == null) {
             await channel.watch();
           }
-          Navigator.pushNamed(
-            context,
+          navigator.pushNamed(
             Routes.CHANNEL_PAGE,
             arguments: ChannelPageArgs(
               channel: channel,