[removing] Remove DowngradeArraySpreadStringKeyRector rule, use DowngradeArraySpreadRector isntead (#342)

Author: TomasVotruba

config/set/downgrade-php81.php

@@ -33,7 +33,6 @@
         DowngradePhp81ResourceReturnToObjectRector::class,
         DowngradeReadonlyPropertyRector::class,
         DowngradeArraySpreadRector::class,
-        // DowngradeArraySpreadStringKeyRector::class,
         DowngradeArrayIsListRector::class,
         DowngradeSetAccessibleReflectionPropertyRector::class,
         DowngradeIsEnumRector::class,