style: upgrade and apply lint

@@ -133,9 +133,9 @@ class _BarcodeScannerWithControllerState
                         icon: const Icon(Icons.image),
                         iconSize: 32.0,
                         onPressed: () async {
-                          final ImagePicker _picker = ImagePicker();
+                          final ImagePicker picker = ImagePicker();
                           // Pick an image
-                          final XFile? image = await _picker.pickImage(
+                          final XFile? image = await picker.pickImage(
                             source: ImageSource.gallery,
                           );
                           if (image != null) {

@@ -16,7 +16,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  lint: ^1.8.2
+  lint: ^1.10.0
 
 flutter:
   uses-material-design: true

@@ -29,12 +29,12 @@ class MobileScanner extends StatefulWidget {
 
   /// Create a [MobileScanner] with a [controller], the [controller] must has been initialized.
   const MobileScanner({
-    Key? key,
+    super.key,
     required this.onDetect,
     this.controller,
     this.fit = BoxFit.cover,
     this.allowDuplicates = false,
-  }) : super(key: key);
+  });
 
   @override
   State<MobileScanner> createState() => _MobileScannerState();
@@ -75,7 +75,7 @@ class _MobileScannerState extends State<MobileScanner>
       builder: (context, value, child) {
         value = value as MobileScannerArguments?;
         if (value == null) {
-          return Container(color: Colors.black);
+          return const ColoredBox(color: Colors.black);
         } else {
           controller.barcodes.listen((barcode) {
             if (!widget.allowDuplicates) {

@@ -17,7 +17,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  lint: ^1.8.2
+  lint: ^1.10.0
 
 flutter:
   plugin: