WooCommerce Store Credit 4.5.6

* Tweak - Declare compatibility with WooCommerce High-Performance Order Storage (HPOS).
* Tweak - Tested compatibility with WC 7.1.

* Tweak - Don't restore the credit when the order status changes to 'failed'.
* Tweak - Tested compatibility up to WC 7.0.
* Tweak - Tested compatibility with WP 6.1.
* Fix - Store Credit wasn't re-applied to an order successfully paid after the first payment failed.
* Fix - Store Credit was incorrectly restored after canceling the PayPal payment process.

* Tweak - Don't allow adding to the cart Store Credit products with zero credit amount.
* Tweak - The custom credit amount field is required when adding to the cart a Store Credit product without a default credit amount.
* Tweak - Tested compatibility with WC 6.8