fix cs

Author: mspirkov

src/Rule/ForbidPhpDocNullabilityMismatchWithNativeTypehintRule.php

@@ -17,8 +17,8 @@
 use PHPStan\Type\FileTypeMapper;
 use PHPStan\Type\MixedType;
 use PHPStan\Type\NullType;
-use PHPStan\Type\VoidType;
 use PHPStan\Type\Type;
+use PHPStan\Type\VoidType;
 use function array_merge;
 use function is_string;