Revert "Avoid "use" for Attribute usage not supported in PHP < 8.0"

This reverts commit 045fcab.

src/xml/ElementCollection.php

@@ -13,6 +13,7 @@
 use DOMElement;
 use DOMNodeList;
 use Iterator;
+use ReturnTypeWillChange;
 use function count;
 use function get_class;
 use function sprintf;
@@ -30,7 +31,7 @@ public function __construct(DOMNodeList $nodeList) {
         $this->importNodes($nodeList);
     }
 
-    #[\ReturnTypeWillChange]
+    #[ReturnTypeWillChange]
     abstract public function current();
 
     public function next(): void {