EntityRepository.stub fix nullability in findOneBy

Author: janedbal

stubs/EntityRepository.stub

@@ -42,7 +42,7 @@ class EntityRepository implements ObjectRepository
 	 * @phpstan-param array<string, string>|null $orderBy
 	 * @phpstan-return TEntityClass|null
 	 */
-	public function findOneBy(array $criteria, array $orderBy = null);
+	public function findOneBy(array $criteria, ?array $orderBy = null);
 
 	/**
 	 * @phpstan-return class-string<TEntityClass>