chore(deps): bump sabberworm/php-css-parser from 8.5.1 to 8.6.0

Bumps [sabberworm/php-css-parser](https://github.com/MyIntervals/PHP-CSS-Parser) from 8.5.1 to 8.6.0.
- [Release notes](https://github.com/MyIntervals/PHP-CSS-Parser/releases)
- [Changelog](https://github.com/MyIntervals/PHP-CSS-Parser/blob/v8.6.0/CHANGELOG.md)
- [Commits](MyIntervals/PHP-CSS-Parser@v8.5.1...v8.6.0)

---
updated-dependencies:
- dependency-name: sabberworm/php-css-parser
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>