Upgrade: Bump gulp-uglify-es from 2.0.0 to 3.0.0

Bumps [gulp-uglify-es](https://gitlab.com/itayronen/gulp-uglify-es) from 2.0.0 to 3.0.0.
- [Release notes](https://gitlab.com/itayronen/gulp-uglify-es/tags)
- [Changelog](https://gitlab.com/itayronen/gulp-uglify-es/blob/master/CHANGELOG.md)
- [Commits](https://gitlab.com/itayronen/gulp-uglify-es/commits/master)

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

Author: dependabot-preview[bot]

package.json

@@ -42,7 +42,7 @@
     "gulp-server-livereload": "^1.9.2",
     "gulp-sri": "^0.3.1",
     "gulp-transform": "^3.0.5",
-    "gulp-uglify-es": "^2.0.0",
+    "gulp-uglify-es": "^3.0.0",
     "gulp-useref": "^5.0.0",
     "gulp-zopfli-node": "^1.0.0",
     "hexo": "^5.2.0",