Stop using deprecated option

Since `doctrine/doctrine-bundle` 3.1, auto_mapping is deprecated and
only accepts false.

Author: greg0ire

tests/DependencyInjection/DoctrineMigrationsExtensionTest.php

@@ -326,7 +326,6 @@ public function testCustomEntityManager(): void
                     'custom' => null,
                     'acb' => null,
                 ],
-                'controller_resolver' => ['auto_mapping' => false],
             ],
         );