fix: we don't use the type anywhere in this method

Author: jpswade

src/main/resources/handlebars/php/ObjectSerializer.mustache

@@ -33,12 +33,11 @@ class ObjectSerializer
      * Serialize data
      *
      * @param mixed  $data   the data to serialize
-     * @param string $type   the SwaggerType of the data
      * @param string $format the format of the Swagger type of the data
      *
      * @return string|object serialized form of $data
      */
-    public static function sanitizeForSerialization($data, $type = null, $format = null)
+    public static function sanitizeForSerialization($data, $format = null)
     {
         if (is_scalar($data) || null === $data) {
             return $data;