Constant PCM\Managers\FILTER_SANITIZE_STRING is deprecated

I am still getting with PHP v.8.1:
Deprecated: Constant PCM\Managers\FILTER_SANITIZE_STRING is deprecated in?…\wp-content\plugins\posts-columns-manager\app\managers\class-filters-manager.php?on line?186

Warning in the All Pages page of the back-end now.

I reported this issue 8 months ago… but the plugin was not updated for a year now…