Fix A tree builder without a root node deprecation in Symfony 4.2

[evs-xsarus]

A tree builder without a root node is deprecated since Symfony 4.2 and will not be supported anymore in 5.0.

The "Symfony\Component\Config\Definition\Builder\TreeBuilder::root()" method called for the "lexik_data_layer" configuration is deprecated since Symfony 4.3, pass the root name to the constructor instead.

See https://github.com/lexik/LexikDataLayerBundle/blob/master/DependencyInjection/Configuration.php

Fix would be:

<?php

namespace Lexik\Bundle\DataLayerBundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

/**
 * Configuration
 */
class Configuration implements ConfigurationInterface
{
    /**
     * {@inheritdoc}
     */
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder('lexik_data_layer');
        // BC layer for symfony/config < 4.2
        $rootNode = method_exists($treeBuilder, 'getRootNode') ? $treeBuilder->getRootNode() : $treeBuilder->root('apy_breadcrumb_trail');

        return $treeBuilder;
    }
}