Build(deps-dev): Bump rtlcss from 4.1.1 to 4.2.0

Bumps [rtlcss](https://github.com/MohammadYounes/rtlcss) from 4.1.1 to 4.2.0.
- [Release notes](https://github.com/MohammadYounes/rtlcss/releases)
- [Changelog](https://github.com/MohammadYounes/rtlcss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/MohammadYounes/rtlcss/compare/v4.1.1...v4.2.0

)

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

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