Bump @babel/preset-env from 7.7.1 to 7.7.4 in /website (#7045)

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.7.1 to 7.7.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v7.7.1...v7.7.4)

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Co-authored-by: null <27856297+dependabot-preview[bot]@users.noreply.github.com>

website/package.json

@@ -19,7 +19,7 @@
     "react-dom": "16.12.0"
   },
   "devDependencies": {
-    "@babel/preset-env": "7.7.1",
+    "@babel/preset-env": "7.7.4",
     "@babel/preset-react": "7.7.0",
     "@sandhose/prettier-animated-logo": "1.0.3",
     "babel-loader": "8.0.6",