Fix compatibility with latest phpstan patch 2.1.x-dev

[samsonasik]

Fixes rectorphp/rector#9763

step to reproduce:

1. Temporary change composer.json phpstan/phpstan require to 2.1.x-dev
2. Run unit test

There was 1 failure:

1) Rector\Tests\TypeDeclaration\Rector\ArrowFunction\AddArrowFunctionReturnTypeRector\AddArrowFunctionReturnTypeRectorTest::test#2 with data ('/Users/samsonasik/www/rector-...hp.inc')
Failed on fixture file "return_by_array_shape_type.php.inc"
Failed asserting that string matches format description.
--- Expected
+++ Actual
@@ @@
      */
     private function foo(array $values): void
     {
-        $bars = array_map(fn($value): int => $value['bar'], $values);
+        $bars = array_map(fn($value) => $value['bar'], $values);
     }
 }
 
-?>

This PR apply the patch to keep working as expected so array shape is keep followed.

[samsonasik]

@VincentLanglet this should fix rectorphp/rector#9763

[samsonasik]

All green 🎉 @TomasVotruba let's merge ;)