[wpmlwpseo-302] Update wordpress coding standards to ^3

To match https://git.onthegosystems.com/wpml/wpml-plugin-template/-/blob/master/vendor-bin/sniff/composer.json

Closes https://onthegosystems.myjetbrains.com/youtrack/issue/wpmlwpseo-302/phpcs-mismatch

Author: dgwatkins