WooCommerce Pre-Orders 2.1.0

* Fix - Set order status to pre-ordered when processing failed order if the product can be pre-ordered.
* Dev - Bump WordPress "tested up to" version from 6.2 to 6.3.
* Add - Introduced filter wc_pre_orders_product_can_be_pre_ordered within WC_Pre_Orders_Product:roduct_can_be_pre_ordered().
* Tweak - Use variation ID for determining if cart contains a pre-order product.

* Dev – Bump WooCommerce “tested up to” version 7.6.
* Dev – Bump WordPress minimum supported version from 5.6 to 5.8.
* Dev – Bump WordPress “tested up to” version 6.2.
* Fix – Prevent countdowns of trashed products from showing up.
* Update – Improve escaping of the URLs for the different Pre-Order statuses.
* Update – Replace the use of “extract” for retrieving the attributes of the countdown shortcode.

* Fix - Layout attribute in the countdown timer.
* Fix - Improve the "Shop loop product message" description.