fix: add void return type to LimeniusLiformBundle::build() for Symfony 8

[francis-roux-serret]

Problem

Tag 2.1 bumped composer.json to declare Symfony ^8.0 support, but the code change for it wasn't included. On Symfony 8, Symfony\Component\HttpKernel\Bundle\Bundle::build() is typed as : void, so the current signature in LimeniusLiformBundle::build() triggers a fatal compile error when the kernel initializes bundles:

Compile Error: Declaration of Limenius\LiformBundle\LimeniusLiformBundle::build(
    Symfony\Component\DependencyInjection\ContainerBuilder $container
) must be compatible with Symfony\Component\HttpKernel\Bundle\Bundle::build(
    Symfony\Component\DependencyInjection\ContainerBuilder $container
): void

Reproduced on a Symfony 8 / PHP 8.5 project by installing limenius/liform-bundle:^2.1 and running bin/console cache:clear.

Fix

Add : void to LimeniusLiformBundle::build(). This is compatible with Symfony 5.4/6/7 as well (the parent has been : void since Symfony 4.4).

Notes

This is the last remaining piece of Symfony 8 support after #. Nothing else needs to change.