DX: apply rector rules for phpunit up to 90

rector.php

@@ -27,6 +27,7 @@ return static function (RectorConfig $rectorConfig): void {
         LevelSetList::UP_TO_PHP_82,
         \Rector\Symfony\Set\SymfonyLevelSetList::UP_TO_SYMFONY_44,
         \Rector\Doctrine\Set\DoctrineSetList::DOCTRINE_CODE_QUALITY,
+        \Rector\PHPUnit\Set\PHPUnitLevelSetList::UP_TO_PHPUNIT_90,
     ]);
 
     // some routes are added twice if it remains activated