add symfony 6 support

Author: flavou45

src/Mapping/AttributeAnnotationReader.php

@@ -1,12 +1,5 @@
 <?php
 
-/*
- * This file is part of the Doctrine Behavioral Extensions package.
- * (c) Gediminas Morkevicius <gediminas.morkevicius@gmail.com> http://www.gediminasm.org
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
 namespace Ambta\DoctrineEncryptBundle\Mapping;
 
 use Doctrine\Common\Annotations\Reader;

src/Mapping/AttributeReader.php

@@ -1,12 +1,5 @@
 <?php
 
-/*
- * This file is part of the Doctrine Behavioral Extensions package.
- * (c) Gediminas Morkevicius <gediminas.morkevicius@gmail.com> http://www.gediminasm.org
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
 namespace Ambta\DoctrineEncryptBundle\Mapping;
 
 use Attribute;