Remove TreeBuilder deprecation

DependencyInjection/Configuration.php

@@ -20,8 +20,12 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $treeBuilder->root('translation_tools');
+        if (method_exists(TreeBuilder::class, 'getRootNode')) {
+            $treeBuilder = new TreeBuilder('translation_tools');
+        } else {
+            $treeBuilder = new TreeBuilder();
+            $treeBuilder->root('translation_tools');
+        }
 
         return $treeBuilder;
     }

Tests/DependencyInjection/ConfigurationTest.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * This file is authored by PrestaShop SA and Contributors <contact@prestashop.com>
+ *
+ * It is distributed under MIT license.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace PrestaShop\TranslationToolsBundle\Tests\DependencyInjection;
+
+use PrestaShop\TranslationToolsBundle\DependencyInjection\Configuration;
+use PrestaShop\TranslationToolsBundle\Tests\PhpUnit\TestCase;
+
+class ConfigurationTest extends TestCase
+{
+    public function testNewConfiguration()
+    {
+        $configuration = new Configuration();
+        $this->assertSame('translation_tools', $configuration->getConfigTreeBuilder()->buildTree()->getName());
+    }
+}