Bump @babel/preset-env from 7.6.3 to 7.7.1

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.6.3 to 7.7.1.
- [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/v7.6.3...v7.7.1)

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

package.json

@@ -78,7 +78,7 @@
     "@babel/core": "^7.6.4",
     "@babel/plugin-proposal-class-properties": "^7.5.5",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
-    "@babel/preset-env": "^7.6.3",
+    "@babel/preset-env": "^7.7.1",
     "@nextcloud/browserslist-config": "^1.0.0",
     "babel-eslint": "^10.0.3",
     "babel-loader": "^8.0.6",