v0.6.0

Dropped support for Sylius versions before the v1.11. Dropped support for Symfony 4. Dropped support for PHP 7.
Added support for PHP 8.1 and Sylius 1.12.

What's Changed

• Sylius v1.12 compatibility by @lruozzi9 in #14

Full Changelog: v0.5.0...v0.6.0