Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires larastan/larastan ^3.1 -> satisfiable by larastan/larastan[v3.1.0, 3.x-dev].
- Root composer.json requires phpstan/phpstan-phpunit ^1.3 -> satisfiable by phpstan/phpstan-phpunit[1.3.0, ..., 1.4.x-dev].
- larastan/larastan[v3.1.0, ..., 3.x-dev] require phpstan/phpstan ^2.1.3 -> satisfiable by phpstan/phpstan[2.1.3, ..., 2.1.x-dev].
- phpstan/phpstan-phpunit 1.3.0 requires phpstan/phpstan ^1.9.0 -> satisfiable by phpstan/phpstan[1.9.0, ..., 1.12.x-dev].
- phpstan/phpstan-phpunit[1.3.5, ..., 1.3.x-dev] require phpstan/phpstan ^1.10 -> satisfiable by phpstan/phpstan[1.10.0, ..., 1.12.x-dev].
- phpstan/phpstan-phpunit[1.3.1, ..., 1.3.4] require phpstan/phpstan ^1.9.3 -> satisfiable by phpstan/phpstan[1.9.3, ..., 1.12.x-dev].
- phpstan/phpstan-phpunit 1.4.0 requires phpstan/phpstan ^1.11 -> satisfiable by phpstan/phpstan[1.11.0, ..., 1.12.x-dev].
- phpstan/phpstan-phpunit[1.4.1, ..., 1.4.x-dev] require phpstan/phpstan ^1.12 -> satisfiable by phpstan/phpstan[1.12.0, ..., 1.12.x-dev].
- You can only install one version of a package, so only one of these can be installed: phpstan/phpstan[1.10.56, ..., 1.12.x-dev, 2.1.6, 2.1.x-dev].