Fixed fixture loading process

Author: jbtronics

src/Doctrine/Purger/DoNotUsePurgerFactory.php

@@ -44,7 +44,7 @@ public function purge(): void
                 throw new \LogicException('Do not use doctrine:fixtures:load directly. Use partdb:fixtures:load instead!');
             }
 
-            public function setEntityManager(EntityManagerInterface $em)
+            public function setEntityManager(EntityManagerInterface $em): void
             {
                 // TODO: Implement setEntityManager() method.
             }