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Your requirements could not be resolved to an installable set of packages. Problem 1 - phpstan/extension-installer[1.4.0, ..., 1.4.3] require php ^7.2 || ^8.0 -> your php version (7.1.33) does not satisfy that requirement. - Root composer.json requires phpstan/extension-installer ^1.4 -> satisfiable by phpstan/extension-installer[1.4.0, 1.4.1, 1.4.2, 1.4.3].