WooCommerce Bookings 2.1.2

* Dev - Bump WooCommerce "tested up to" version 8.8.
* Dev - Bump WooCommerce minimum supported version to 8.6.
* Update - Register Bookings product type even when `is_admin()` is false.
* Update - Replace the middleware URL from `connect.woocommerce.com` to `api.woocommerce.com/integrations`.

* Dev - Bump WooCommerce "tested up to" version 8.6.
* Dev - Bump WooCommerce minimum supported version to 8.4.
* Fix - Clear cache when booking is trashed/untrashed.
* Fix - Error when adding a global add-on while WooCommerce Bookings and Jetpack are active.
* Update - Hide "(x left)" text in the end time dropdown when there is only 1 quantity resourced.
* Update - Revert Booking status to "in-cart" when order fails to enable re-payment.

* Dev - Bump PHP "tested up to" version 8.3.
* Dev - Bump WooCommerce "tested up to" version 8.5.
* Dev - Bump WooCommerce minimum supported version to 8.3.
* Dev - Bump WordPress minimum supported version to 6.3.
* Fix - Set the place order label in the Block checkout page when order requires confirmation.
* Fix - Slow checkout performance for high-volume sites.
* Fix - Remove Cart Block incompatibility notice.
* Tweak - Ensure New Bookable Product link goes to template selection screen.