Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader...

Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings

composer/Plugin/Scaffold/Operations/ScaffoldFileCollection.php

@@ -115,8 +115,7 @@ protected function checkListHasItemWithContent(array $scaffold_files) {
   /**
    * {@inheritdoc}
    */
-  #[\ReturnTypeWillChange]
-  public function getIterator() {
+  public function getIterator(): \ArrayIterator {
     return new \ArrayIterator($this->scaffoldFilesByProject);
   }