Update for Flutter 3.10 beta (#1746)

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [ ] All existing and new tests are passing.

---------

Co-authored-by: David Iglesias <ditman@gmail.com>
Co-authored-by: Mark Thompson <2554588+MarkTechson@users.noreply.github.com>
Co-authored-by: John Ryan <ryjohn@google.com>

experimental/varfont_shader_puzzle/lib/components/wonky_char.dart

@@ -135,27 +135,22 @@ class WonkyCharState extends State<WonkyChar>
             {
               _scaleAnimation = animation;
             }
-            break;
           case 'rotation':
             {
               _rotationAnimation = animation;
             }
-            break;
           case 'offsetX':
             {
               _offsetXAnimation = animation;
             }
-            break;
           case 'offsetY':
             {
               _offsetYAnimation = animation;
             }
-            break;
           case 'color':
             {
               _colorAnimation = animation;
             }
-            break;
           default:
             {
               if (kDebugMode) {

experimental/varfont_shader_puzzle/pubspec.yaml

@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.19.5 <4.0.0'
+  sdk: ^3.0.0-0
 
 dependencies:
   flutter: