Bump @babel/preset-env from 7.6.0 to 7.7.1 (mastodon#12318)

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.6.0 to 7.7.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v7.6.0...v7.7.1)

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

Author: dependabot-preview[bot]

package.json

@@ -68,7 +68,7 @@
     "@babel/plugin-transform-react-jsx-self": "^7.2.0",
     "@babel/plugin-transform-react-jsx-source": "^7.5.0",
     "@babel/plugin-transform-runtime": "^7.5.5",
-    "@babel/preset-env": "^7.6.0",
+    "@babel/preset-env": "^7.7.1",
     "@babel/preset-react": "^7.6.3",
     "@babel/runtime": "^7.5.4",
     "@clusterws/cws": "^0.15.2",