Bump uglify-js from 3.15.3 to 3.15.4
Bump uglify-js from 3.15.3 to 3.15.4

Bumps [uglify-js](https://github.com/mishoo/UglifyJS) from 3.15.3 to 3.15.4.
- [Release notes](https://github.com/mishoo/UglifyJS/releases)
- [Commits](https://github.com/mishoo/UglifyJS/compare/v3.15.3...v3.15.4)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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