Fix Builder regression

- Fix regression in 2a19c2d where builders cannot create objects from
  arrays that resolve to exactly 1 constructor parameter

Author: lkrms

src/Support/IntrospectorKeyTargets.php

@@ -136,7 +136,7 @@ public function __construct(
         $this->CustomKeys = $customKeys;
 
         if ($this->Parameters) {
-            $this->LastParameterIndex = max(...array_values($parameters));
+            $this->LastParameterIndex = max(array_values($parameters));
         }
     }
 }