fix app test

Author: kmcfaul

packages/dev/src/App.test.tsx

@@ -1,10 +1,9 @@
-import { createRoot } from 'react-dom';
+import { createRoot } from 'react-dom/client';
 import App from './AppContext';
 
 it('renders without crashing', () => {
   const div = document.createElement('div');
   const root = createRoot(div);
   root.render(<App />);
-  const root = createRoot(div);
   root.unmount();
 });