fix(llc, core): fix message pagination parameters

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -889,7 +889,7 @@ class _StreamMessageListViewState extends State<StreamMessageListView> {
       initialIndex = 0;
       await streamChannel!.reloadChannel();
 
-      WidgetsBinding.instance?.addPostFrameCallback((_) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
         _scrollController!.jumpTo(index: 0);
       });
     } else {
@@ -1341,7 +1341,7 @@ class _StreamMessageListViewState extends State<StreamMessageListView> {
         if (event.message?.parentId == widget.parentMessage?.id &&
             event.message!.user!.id ==
                 streamChannel!.channel.client.state.currentUser!.id) {
-          WidgetsBinding.instance!.addPostFrameCallback((_) {
+          WidgetsBinding.instance.addPostFrameCallback((_) {
             _scrollController?.scrollTo(
               index: 0,
               duration: const Duration(seconds: 1),

packages/stream_chat_flutter/lib/src/v4/message_input/stream_message_input.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: deprecated_member_use_from_same_package
+
 import 'dart:async';
 import 'dart:math';
 

packages/stream_chat_flutter/test/scrollable_positioned_list/scrollable_positioned_list_test.dart

@@ -1317,7 +1317,7 @@ void main() {
     await setUpWidgetTest(tester, itemPositionsListener: itemPositionsListener);
 
     final root = WidgetsBinding
-        .instance!.pipelineOwner.semanticsOwner!.rootSemanticsNode!;
+        .instance.pipelineOwner.semanticsOwner!.rootSemanticsNode!;
 
     final semanticNodes = <SemanticsNode>[root];