feat: add support for Sylius 1.12 and Symfony 6

[JulienLoison]

Plugin Skeleton Commit 982a18066cd36373ff236e032b9f85b3d84b0372

• [ ] Handle configurations for Sylius 1.11 to validate checks
• [ ] Allow to use this pre-release
• [ ] Fix and report on pending issues

[github-actions[bot]]

:tada: This PR is included in version 3.0.0 :tada:

The release is available on GitHub release

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