L11 compatibility

[LTKort]

Adds Laravel 11 support in composer (issue #508).
This also reverts #490 as stated in #507
And includes the PR #506 for issue #505

---

I have not tested this on this repo, we use our own fork.
To test or use these changes, temporarily add my fork to the repositories property of your composer.json:

{
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/ltkort/nova-flexible-content.git"
        }
    ]
}

Then update your dependency constraint to reference this branch:

{
    "require": {
        "whitecube/nova-flexible-content": "dev-l11-compatibility",
    }
}

Finally, run: composer update

[voidgraphics]

Thank you! Willing to merge if a couple people can please verify, I can't do it right now

[lozobojan]

Fixed the issue for me. Thanks, @LTKort!

[harmenjanssen]

I can also confirm this fixes the issue for me!

[voidgraphics]

Tagged v1.1.0 with this, thanks