Fix use of deprecated Node\Expr\ArrayItem over Node\ArrayItem (#7859)

Author: samsonasik

rules/Php85/Rector/Class_/SleepToSerializeRector.php

@@ -6,7 +6,7 @@
 
 use PhpParser\Node;
 use PhpParser\Node\Expr\Array_;
-use PhpParser\Node\Expr\ArrayItem;
+use PhpParser\Node\ArrayItem;
 use PhpParser\Node\Expr\PropertyFetch;
 use PhpParser\Node\Expr\Variable;
 use PhpParser\Node\Identifier;