Update image URL in Image component example data and test data

The previous image url doesn't on web due because of CORS restrictions.

Author: victoreronmosele

packages/flutter_genui/lib/src/catalog/core_widgets/image.dart

@@ -56,7 +56,7 @@ final image = CatalogItem(
           "component": {
             "Image": {
               "url": {
-                "literalString": "https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png"
+                "literalString": "https://storage.googleapis.com/cms-storage-bucket/lockup_flutter_horizontal.c823e53b3a1a7b0d36a9.png"
               }
             }
           }

packages/flutter_genui/test/image_test.dart

@@ -22,7 +22,7 @@ void main() {
                 data: {
                   'url': {
                     'literalString':
-                        'https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png',
+                        'https://storage.googleapis.com/cms-storage-bucket/lockup_flutter_horizontal.c823e53b3a1a7b0d36a9.png',
                   },
                 },
                 id: 'test_image',
@@ -42,7 +42,7 @@ void main() {
       expect(imageWidget.image, isA<NetworkImage>());
       expect(
         (imageWidget.image as NetworkImage).url,
-        'https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png',
+        'https://storage.googleapis.com/cms-storage-bucket/lockup_flutter_horizontal.c823e53b3a1a7b0d36a9.png',
       );
     });
   });