Bump stripe-php from 16.4.0 to 17.2.1

plugins/stripe-php/lib/Util/Set.php

@@ -2,10 +2,7 @@
 
 namespace Stripe\Util;
 
-use ArrayIterator;
-use IteratorAggregate;
-
-class Set implements IteratorAggregate
+class Set implements \IteratorAggregate
 {
     private $_elts;
 
@@ -38,11 +35,11 @@ class Set implements IteratorAggregate
     }
 
     /**
-     * @return ArrayIterator
+     * @return \ArrayIterator
      */
     #[\ReturnTypeWillChange]
     public function getIterator()
     {
-        return new ArrayIterator($this->toArray());
+        return new \ArrayIterator($this->toArray());
     }
 }