The job was canceled because "highest_8_2" failed.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires jangregor/phpstan-prophecy ^1.0 -> satisfiable by jangregor/phpstan-prophecy[1.0.0, 1.0.1, 1.0.2]. - jangregor/phpstan-prophecy[1.0.0, ..., 1.0.2] require phpstan/phpstan ^1.0.0 -> found phpstan/phpstan[1.0.0, ..., 1.12.10] but it conflicts with your root composer.json require (^2.0).