Bump react-dev-utils from 9.0.1 to 11.0.4 in /app

Bumps [react-dev-utils](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-dev-utils) from 9.0.1 to 11.0.4.
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/master/CHANGELOG-1.x.md)
- [Commits](https://github.com/facebook/create-react-app/commits/HEAD/packages/react-dev-utils)

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

Author: dependabot[bot]

app/package.json

@@ -78,7 +78,7 @@
     "react": "^16.8.6",
     "react-app-polyfill": "^1.0.1",
     "react-cookie": "^4.0.3",
-    "react-dev-utils": "^9.0.1",
+    "react-dev-utils": "^11.0.4",
     "react-dom": "^16.8.6",
     "react-number-format": "^4.2.0",
     "react-redux": "^6.0.1",