⬆️ Upgrade lib : nikic/php-parser

We were on v3 that is no longer maintained and compatibility is annonced for PHP 7.2.
v4 is active and supports PHP up to 8.0
No problem to update as this is only used in the config editor (\Combodo\iTop\Config\Validator\iTopConfigAstValidator)

lib/nikic/php-parser/lib/PhpParser/NodeVisitor.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace PhpParser;
 
@@ -32,7 +32,7 @@ interface NodeVisitor
      *
      * @param Node $node Node
      *
-     * @return null|int|Node Node
+     * @return null|int|Node Replacement node (or special return value)
      */
     public function enterNode(Node $node);
 
@@ -53,7 +53,7 @@ interface NodeVisitor
      *
      * @param Node $node Node
      *
-     * @return null|false|int|Node|Node[] Node
+     * @return null|int|Node|Node[] Replacement node (or special return value)
      */
     public function leaveNode(Node $node);
 
@@ -69,4 +69,4 @@ interface NodeVisitor
      * @return null|Node[] Array of nodes
      */
     public function afterTraverse(array $nodes);
-}
+}