yoast compatibility issue php8

@fertila We currently recommend Yoast SEO to be used with 7.3 or higher, and the plugin has a minimum required PHP version of 5.6.20. You can read our complete plugin requirements here: https://yoast.com/help/plugin-requirements/

Unfortunately we haven’t yet fully tested the plugin with PHP version 8+. If you are experiencing issues with the plugin when using PHP version 8+ we would encourage you to submit a bug report.

We’re actively using the bug tracking on our GitHub repository so your best next step would be to create a new issue for our developers at https://github.com/Yoast/wordpress-seo/issues/new. You will need an account to create a new issue. If this is your first bug report, please check out: https://yoast.com/help/how-to-write-a-good-bug-report/.

Thank you.