After updating to woocommerce 3.7. I get this message, that the theme has outdated templates and that I should contact the theme developer:
Version 3.5.0 ist veraltet. Die Hauptversion ist 3.7.0,
those templates are the ones you have added to your child theme.
GP uses the standard Woo templates so the parent theme will use the correct ones. You will need to update your child theme template to the new version.