Bump uglify-js from 3.15.5 to 3.16.0

Bumps [uglify-js](https://github.com/mishoo/UglifyJS) from 3.15.5 to 3.16.0.
- [Release notes](https://github.com/mishoo/UglifyJS/releases)
- [Commits](mishoo/UglifyJS@v3.15.5...v3.16.0)

---
updated-dependencies:
- dependency-name: uglify-js
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]