feat: Migrate to flutter 2.10.1

lib/src/qr_scanner_overlay_shape.dart

@@ -1,4 +1,3 @@
-import 'dart:ui';
 import 'dart:math';
 
 import 'package:flutter/material.dart';

lib/src/web/flutter_qr_stub.dart

@@ -1,5 +1,5 @@
-import 'package:flutter/widgets.dart';
+import 'package:flutter/material.dart';
 import 'package:qr_code_scanner/src/types/camera.dart';
 
 Widget createWebQrView({onPlatformViewCreated, CameraFacing? cameraFacing}) =>
-    throw UnimplementedError();
+    const SizedBox();

lib/src/web/flutter_qr_web.dart

@@ -6,13 +6,9 @@ import 'dart:html' as html;
 import 'dart:js_util';
 import 'dart:ui' as ui;
 
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 
 import '../../qr_code_scanner.dart';
-import '../qr_code_scanner.dart';
-import '../types/camera.dart';
 import 'jsqr.dart';
 import 'media.dart';