If you are provisioning servers using Runcloud.io, you may encounter an error with WordPress updates of core or plugins due to the following error:

Fatal error: Uncaught Error: Call to undefined function set_time_limit()

This error occurs in the WordPress file wp-admin/includes/class-core-upgrader.php and for me it only occurred when the web app was set to use PHP 8.0, yet worked fine on PHP 7.4.