WooCommerce Método de Envío Royal Mail / Royal Mail 4.0.4

* Add - October 2025 regular and online pricing changes.

* Update - Parcelforce & International Tracked rates.
* Tweak - WooCommerce 10.2 Compatibility.

* Tweak - WooCommerce 10.1 Compatibility.

* Tweak - WooCommerce 10.0 Compatibility.

Tweak - WooCommerce 9.9 Compatibility.

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

* Fix - Parcelforce Global Express EU rates.

* Update - Update Parcelforce international pricing.
* Tweak - PHP 8.4 Compatibility.

* Tweak - WordPress 6.7 compatibility.

* Update - Update pricing based on October 2024 rates.