Drupal 11 compatibility fixes

I merged the MR to the main branch for D11 compatibility, I tested it and looks ok, I'll create a release shortly

I created a new D11 release for this, hopefully there's still some who uses it, I'll mark it as "Fixed" for now, please let me know if it doesn't work for you so I can re-open this ticket and work on it: https://www.drupal.org/project/commerce_paykings/releases/8.x-1.3 →

Automatically closed - issue fixed for 2 weeks with no activity.