Update for latest VS Code / Flutter

Author: DanTup

.devcontainer/devcontainer.json

@@ -3,8 +3,12 @@
 		"dockerfile": "Dockerfile"
 	},
 	"name": "Flutter",
-	"extensions": [
-		"Dart-Code.dart-code",
-		"Dart-Code.flutter"
-	],
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"Dart-Code.dart-code",
+				"Dart-Code.flutter"
+			]
+		}
+	}
 }

lib/main.dart

@@ -26,7 +26,7 @@ class MyApp extends StatelessWidget {
 }
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
+  MyHomePage({super.key, required this.title});
 
   // This widget is the home page of your application. It is stateful, meaning
   // that it has a State object (defined below) that contains fields that affect
@@ -94,10 +94,7 @@ class _MyHomePageState extends State<MyHomePage> {
             Text(
               'You have pushed the button this many times:',
             ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.display1,
-            ),
+            Text('$_counter'),
           ],
         ),
       ),

pubspec.yaml

@@ -2,10 +2,9 @@ name: github_codespaces_flutter_web
 description: A sample Flutter web application.
 version: 1.0.0
 homepage: https://github.com/DanTup/github-codespaces-flutter-web
-author: Danny Tuppeny <[email protected]>
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=3.1.0 <4.0.0"
 
 dependencies:
   flutter: