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_flutter_core/CHANGELOG.md

@@ -1,3 +1,7 @@
+## Upcoming
+
+- Updated minimum supported `SDK` version to Flutter 3.3/Dart 2.18
+
 ## 6.4.0
 
 - Updated `stream_chat` dependency to [`6.4.0`](https://pub.dev/packages/stream_chat/changelog).

packages/stream_chat_flutter_core/example/pubspec.yaml

@@ -18,8 +18,8 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 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:
   # The following adds the Cupertino Icons font to your application.

packages/stream_chat_flutter_core/pubspec.yaml

@@ -6,8 +6,8 @@ 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'
-  flutter: ">=1.17.0"
+  sdk: ">=2.18.0 <4.0.0"
+  flutter: ">=3.3.0"
 
 dependencies:
   collection: ^1.17.0