The job was canceled because "ubuntu-latest_8_1" failed.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^12.0 -> satisfiable by phpunit/phpunit[12.0.0, 12.0.1, 12.0.x-dev, 12.1.x-dev]. - phpunit/phpunit[12.0.0, ..., 12.1.x-dev] require php >=8.3 -> your php version (8.2.27) does not satisfy that requirement.