⬆️ 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We were on v3 that is no longer maintained and compatibility is annonced for PHP 7.2.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/Serializer.php

@@ -1,18 +0,0 @@
-<?php
-
-namespace PhpParser;
-
-/**
- * @deprecated
- */
-interface Serializer
-{
-    /**
-     * Serializes statements into some string format.
-     *
-     * @param array $nodes Statements
-     *
-     * @return string Serialized string
-     */
-    public function serialize(array $nodes);
-}