Bump uglifier from 4.0.2 to 4.1.2
Bump uglifier from 4.0.2 to 4.1.2

Bumps [uglifier](https://github.com/lautis/uglifier) from 4.0.2 to 4.1.2.
- [Changelog](https://github.com/lautis/uglifier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/lautis/uglifier/compare/v4.0.2...v4.1.2)
alphagov/manuals-publisher,alphagov/manuals-publisher,alphagov/manuals-publisher