Deprecated PHP8

Hi,

i have multiple errors :

Deprecated: Creation of dynamic property Auxin_Welcome::$parent_slug is deprecated in /home/gxly9323/respire.labo-rectoverso.re/wp-content/plugins/auxin-elements/includes/classes/class-auxin-welcome.php on line 86

Deprecated: Creation of dynamic property Auxin_Metabox_Model::$is_deprecated is deprecated in /home/gxly9323/respire.labo-rectoverso.re/wp-content/plugins/auxin-elements/admin/includes/metaboxes/metabox-fields-general-header.php on line 22

Deprecated: Creation of dynamic property Auxin_Metabox_Model::$is_deprecated is deprecated in /home/gxly9323/respire.labo-rectoverso.re/wp-content/plugins/auxin-elements/admin/includes/metaboxes/metabox-fields-general-top-header.php on line 22

Deprecated: Creation of dynamic property Auxin_Metabox_Model::$is_deprecated is deprecated in /home/gxly9323/respire.labo-rectoverso.re/wp-content/plugins/auxin-elements/admin/includes/metaboxes/metabox-fields-general-footer.php on line 22

Deprecated for PHP 8