chore: prepare for release.

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

packages/stream_chat_flutter_core/pubspec.yaml

@@ -1,7 +1,7 @@
 name: stream_chat_flutter_core
 homepage: https://github.com/GetStream/stream-chat-flutter
 description: Stream Chat official Flutter SDK Core. Build your own chat experience using Dart and Flutter.
-version: 6.6.0
+version: 7.0.0-beta.1
 repository: https://github.com/GetStream/stream-chat-flutter
 issue_tracker: https://github.com/GetStream/stream-chat-flutter/issues
 
@@ -17,7 +17,7 @@ dependencies:
   freezed_annotation: ^2.4.1
   meta: ^1.9.1
   rxdart: ^0.27.7
-  stream_chat: ^6.6.0
+  stream_chat: ^7.0.0-beta.1
 
 dev_dependencies:
   build_runner: ^2.4.6