Coordination: Prepare for students code using PHP 8.4 #150
Description
Similar to what we did for PHP8.3 in #105 - For exercism/php#884 we need to have the test-runner ready to accept PHP 8.4 code from students. The test-runner itself may run on a different PHP version.
Outline the required work to do here. An actionable list of tasks would be perfect, but any hints are welcome.