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/context_menus/test/default_values_page_test.dart

@@ -45,20 +45,16 @@ void main() {
       case TargetPlatform.iOS:
         expect(
             find.byType(CupertinoTextSelectionToolbarButton), findsNWidgets(2));
-        break;
       case TargetPlatform.macOS:
         expect(find.byType(CupertinoDesktopTextSelectionToolbarButton),
             findsNWidgets(2));
-        break;
       case TargetPlatform.android:
       case TargetPlatform.fuchsia:
         expect(find.byType(TextSelectionToolbarTextButton), findsNWidgets(1));
-        break;
       case TargetPlatform.linux:
       case TargetPlatform.windows:
         expect(
             find.byType(DesktopTextSelectionToolbarButton), findsNWidgets(1));
-        break;
     }
 
     // Tap the next field to hide the context menu.