chore(repo): bump min flutter SDK to 3.13.

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat/pubspec.yaml

@@ -6,11 +6,11 @@ repository: https://github.com/GetStream/stream-chat-flutter
 issue_tracker: https://github.com/GetStream/stream-chat-flutter/issues
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: '>=3.1.0 <4.0.0'
 
 dependencies:
   async: ^2.11.0
-  collection: ^1.17.1
+  collection: ^1.17.2
   dio: ^5.3.2
   equatable: ^2.0.5
   freezed_annotation: ^2.4.1