Back In Stock Notifications for WooCommerce 3.3.0

* Dev - Removed deprecated WC_BIS_Core_Compatibility::wc_current_theme_is_fse_theme.

New - Added compatibility with WordPress 6.7.

* Fix - Fixed fatal error in own version of WP_Background_Process.

* Tweak - Updated version of @somewherewarm/selectsw dependency to include updated styling.
* Tweak - Removed navigation integration (deprecated WooCommerce feature).
* New - Tested up to WooCommerce v9.2.

* Important - New: PHP 7.4+ is now required.
* Important - New: WooCommerce 8.2+ is now required.
* Important - New: WordPress 6.2+ is now required.
* Important - Removed all previously deprecated code
* Fix - Included own copy of WP_Background_Process library to avoid conflicts with other plugins.

* New - Introduced support for the new Product Editor.
* Fix - Resolved an issue that prevented admin notices from showing up.

New - Added compatibility with PHP 8.3.

* Fix - Important: Security improvements.
* Tweak - Declared compatibility with the cart/checkout Blocks.

Tweak - Updated the way screen IDs are constructed to avoid issues with translated WooCommerce instances.