Use stable React by default in Sandpacks (#7709)

Author: eps1lon

src/components/MDX/Sandpack/template.ts

@@ -28,8 +28,8 @@ root.render(
           eject: 'react-scripts eject',
         },
         dependencies: {
-          react: '19.0.0-rc-3edc000d-20240926',
-          'react-dom': '19.0.0-rc-3edc000d-20240926',
+          react: '^19.1.0',
+          'react-dom': '^19.1.0',
           'react-scripts': '^5.0.0',
         },
       },