chore(llc, core, persistence, ui, localization): updated minimum supported SDK version to Flutter 3.3/Dart 2.18

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

packages/stream_chat/CHANGELOG.md

@@ -1,3 +1,9 @@
+## Upcoming
+
+🔄 Changed
+
+- Updated minimum supported `SDK` version to Dart 2.18
+
 ## 6.4.0
 
 🐞 Fixed

packages/stream_chat/example/pubspec.yaml

@@ -5,8 +5,8 @@ publish_to: "none"
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.17.0 <4.0.0'
-  flutter: ">=1.17.0"
+  sdk: '>=2.18.0 <4.0.0'
+  flutter: ">=3.3.0"
 
 dependencies:
   cupertino_icons: ^1.0.5

packages/stream_chat/pubspec.yaml

@@ -6,7 +6,7 @@ repository: https://github.com/GetStream/stream-chat-flutter
 issue_tracker: https://github.com/GetStream/stream-chat-flutter/issues
 
 environment:
-  sdk: '>=2.17.0 <4.0.0'
+  sdk: '>=2.18.0 <4.0.0'
 
 dependencies:
   async: ^2.10.0