Bump uglifier from 4.1.14 to 4.1.15

Bumps [uglifier](https://github.com/lautis/uglifier) from 4.1.14 to 4.1.15.
- [Release notes](https://github.com/lautis/uglifier/releases)
- [Changelog](https://github.com/lautis/uglifier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/lautis/uglifier/compare/v4.1.14...v4.1.15)

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