WooCommerce Gravity Forms Product Add-Ons 3.6.6

* Update - Handle the fix from 3.6.5 better. The data-formid attribute was not being added to the form element in all situations.
* Update - Bump script versions to force cache busting.
* Update - WC and WP Compatibility Tags.

* Fix: Fix issue with reordering products with file upload fields and required fields.
* Fix: Fix issue where variable products could not be added to a Wishlist properly.
* Update: Respect the woocommerce_gforms_use_label_as_value setting for fields that do not have entry inputs.
* Update: Better handling for Limit purchases to 1 item per order. Filter the cart_id to remove data that changes or could change between form submissions, but is not related to the actual data of the form.

n/a