Bump rtlcss from 3.5.0 to 4.0.0

Bumps [rtlcss](https://github.com/MohammadYounes/rtlcss) from 3.5.0 to 4.0.0.
- [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/v3.5.0...v4.0.0)

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

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

package.json

@@ -143,7 +143,7 @@
     "postcss-cli": "^10.0.0",
     "rollup": "^2.77.2",
     "rollup-plugin-istanbul": "^3.0.0",
-    "rtlcss": "^3.5.0",
+    "rtlcss": "^4.0.0",
     "sass": "^1.54.2",
     "shelljs": "^0.8.5",
     "stylelint": "^14.9.1",