chore: fix php code style

Author: lukadschaak

src/NeustaPimcoreFixtureBundle.php

@@ -14,7 +14,7 @@ public function getPath(): string
         return \dirname(__DIR__);
     }
 
-    public function build(ContainerBuilder $container)
+    public function build(ContainerBuilder $container): void
     {
         parent::build($container);