Sylius 1.12 - Symfony 6 - PHP 8.1

What's Changed

• Fix CI by @vasilvestre in #281
• Use webpack, node 14 and test plugin against Sylius 1.12 and PHP 8.1 by @vasilvestre in #280
• Test build fix for master by @vasilvestre in #283
• Fix twig deprecations by @vasilvestre in #284
• Enable spec by @vasilvestre in #282
• Add symfony 6 compatibility by @vasilvestre in #286

Full Changelog: 0.22.0...0.23.0