build(deps): bump gulp-rtlcss from 1.4.1 to 1.4.2

Bumps [gulp-rtlcss](https://github.com/jjlharrison/gulp-rtlcss) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/jjlharrison/gulp-rtlcss/releases)
- [Changelog](https://github.com/jjlharrison/gulp-rtlcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jjlharrison/gulp-rtlcss/commits)

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