YITH WooCommerce Color and Label Variations Premium 2.8.1

* Fix: undefined label when you choose a specific attribute

* New: support for WooCommerce 8.5
* Update: YITH plugin framework
* Dev: filter yith_wccl_wrapper_price_shop_js

* New: support for WooCommerce 5.3
* New: added German translation
* New: Astra theme compatibility
* Update: YITH plugin framework
* Update: language files