WooCommerce Stamps.com API 2.3.0

* Add - Non-delivery option in the settings and Stamps widget.

* Tweak - WooCommerce 10.0 compatibility.

Fix - Error: "Surcharges cannot be specified as part of the request, but they may be returned as part of the response".

* Update Requires headers for WooCommerce compatibility.
* Update to ubuntu-latest to fix QIT tests.

* Tweak - WordPress 6.7 & WooCommerce 9.3 Compatibility.
* Fix - Automated translation from WordPress.com.

* Tweak - WordPress 6.6 & WooCommerce 9.0 Compatibility.

* Fix - Display nested addon names instead of repeating parent addon name.

* Tweak - WC 8.6 compatibility.

Update - Security update.

* Add - Declared HPOS compatibility.