chore(llc,core,ui): update pubspec and changelogs

packages/stream_chat_flutter/CHANGELOG.md

@@ -1,4 +1,4 @@
-## Upcoming
+## 4.0.0-beta.2
 
 ✅ Added
 
@@ -6,6 +6,13 @@
 - Added support to control the visibility of the default emoji suggestions overlay
 - Added support to build custom widget for scrollToBottom in `StreamMessageListView`
 
+🐞 Fixed
+
+- Minor fixes and improvements
+-[[#892]](https://github.com/GetStream/stream-chat-flutter/issues/892): Fix default `initialAlignment` in `MessageListView`.
+- Fix `MessageInputTheme.inputBackgroundColor` color not being used in some widgets of `MessageInput`
+- Removed dependency on `visibility_detector`
+
 ## 4.0.0-beta.1
 
 ✅ Added