build(deps): bump react-scripts from 3.1.2 to 4.0.3

Bumps [react-scripts](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-scripts) from 3.1.2 to 4.0.3.
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/main/CHANGELOG-3.x.md)
- [Commits](https://github.com/facebook/create-react-app/commits/react-scripts@4.0.3/packages/react-scripts)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

packages/example/package.json

@@ -16,7 +16,7 @@
     "randomcolor": "^0.5.4",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
-    "react-scripts": "3.1.2",
+    "react-scripts": "4.0.3",
     "slate": "0.59.0",
     "slate-history": "0.58.3",
     "slate-react": "0.59.0"