WooCommerce Account Funds 3.0.1

* Tweak - Tested compatibility up to WC 8.5.
* Fix - Fixed error when generating a funds discount code before the `WC_Session` object is initialized.
* Dev - Improved compatibility with PHP 8.2 by not declaring dynamic properties in classes.

Tweak - Display the "Refund via Account Funds" button for orders paid with a different payment gateway only on WC 6.8+.

* Tweak - Declare compatibility with WooCommerce High-Performance Order Storage (HPOS).

* Tweak - Check if the funds are still applicable to the cart when its items are updated.
* Fix - Funds were not being removed from the cart after adding a deposit product.

2022-10-17 - v2.7.1
* Tweak - Skip the v2.3.7 migration script when updating from a version older than 2.3.0.
* Tweak - Tested compatibility up to WC 7.0.
* Tweak - Tested compatibility with WP 6.1.