Bump @babel/preset-env from 7.8.3 to 7.8.6

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.8.3 to 7.8.6.
- [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/v7.8.3...v7.8.6)

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package.json

@@ -84,7 +84,7 @@
     "@babel/core": "^7.8.4",
     "@babel/plugin-proposal-class-properties": "^7.8.3",
     "@babel/plugin-syntax-dynamic-import": "^7.8.3",
-    "@babel/preset-env": "^7.8.3",
+    "@babel/preset-env": "^7.8.6",
     "@nextcloud/browserslist-config": "^1.0.0",
     "babel-eslint": "^10.0.3",
     "babel-loader": "^8.0.6",