Bump react from 16.12.0 to 16.13.0 in /components/frontend

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) from 16.12.0 to 16.13.0.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v16.13.0/packages/react)

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

components/frontend/package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "history": "^4.10.1",
     "md5": "^2.2.1",
-    "react": "^16.12.0",
+    "react": "^16.13.0",
     "react-dom": "^16.13.0",
     "react-grid-layout": "^0.18.2",
     "react-hash-link": "1.0.0",