Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpstan/phpstan ^1.10 -> satisfiable by phpstan/phpstan[1.10.0, ..., 1.10.50]. - phpstan/phpstan[1.10.0, ..., 1.10.50] require php ^7.2|^8.0 -> your php version (7.1.33) does not satisfy that requirement.

Process completed with exit code 2.

Process completed with exit code 1.