fix downgrade skip array type

Author: samsonasik

rules/DowngradePhp81/Rector/Array_/DowngradeArraySpreadStringKeyRector.php

@@ -4,6 +4,8 @@
 
 namespace Rector\DowngradePhp81\Rector\Array_;
 
+use PHPStan\Type\UnionType;
+use PHSPtan\Type\IntersectionType;
 use PhpParser\Node;
 use PhpParser\Node\ArrayItem;
 use PhpParser\Node\Expr\Array_;
@@ -94,6 +96,14 @@ private function shouldSkipArray(Array_ $array): bool
                 continue;
             }
 
+            if ($type instanceof UnionType) {
+                continue;
+            }
+
+            if ($type instanceof IntersectionType) {
+                continue;
+            }
+
             /** @var ArrayType|ConstantArrayType $type */
             $keyType = $type->getKeyType();
             if ($keyType instanceof IntegerType) {