chore(deps-dev): update phpstan/phpstan requirement from ^0.12.90 || ^1.0.0 to ^0.12.90 || ^1.0.0 || ^2.0.0

chore(deps-dev): update phpstan/phpstan requirement from ^0.12.90 || ^1.0.0 to ^0.12.90 || ^1.0.0 || ^2.0.0 #68