Bump @babel/preset-env from 7.7.7 to 7.8.4

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.7.7 to 7.8.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.7.7...v7.8.4)

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

package.json

@@ -38,7 +38,7 @@
     "@babel/plugin-proposal-decorators": "^7.7.4",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.7.4",
     "@babel/plugin-proposal-optional-chaining": "^7.7.5",
-    "@babel/preset-env": "^7.7.7",
+    "@babel/preset-env": "^7.8.4",
     "@babel/preset-react": "^7.7.4",
     "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.4",