The job was canceled because "_7_1" failed.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php >=7.4.0 but your php version (5.6.40) does not satisfy that requirement. Problem 2 - phpunit/phpunit[9.6.0, ..., 9.6.20] require php >=7.3 -> your php version (5.6.40) does not satisfy that requirement. - Root composer.json requires phpunit/phpunit ~9.6 -> satisfiable by phpunit/phpunit[9.6.0, ..., 9.6.20].