What's in this PR?

Fix incompatibility to Symfony 6.4 renderBlock method.

Why?

Symfony introduced its own renderBlock method and we need to migrate to the compatible renderBlockView method.

Upgrade

Actually the upgrade here is hard, from Sulu side it would be.

// before
$this->renderBlock(...);

// after
$this->renderBlockView(...);

but this would manipulate all renderBlock methods and rector rules should work always. So in this case we would need a custom rule which checks if the result of renderBlock/renderBlockView is used as a string or response.

// before
$response = $this->renderBlock(...);
$string = $this->renderBlock(...);

new Response($string);

// after
$response = $this->renderBlock(...);
$string = $this->renderBlockView(...);

new Response($string);

So that is the hard case here to create automatic upgrade 🤔 . Inheritance make things always harder then composition.