phpunit/phpunit[7.5.0, ..., 7.5.20, 8.0.0, ..., 8.1.6] require sebastian/diff ^3.0 -> satisfiable by sebastian/diff[3.0.0, ..., 3.0.x-dev] from composer repo (https://repo.packagist.org) but sebastian/diff is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance.
phpunit/phpunit[8.2.0, ..., 8.5.33] require sebastian/diff ^3.0.2 -> satisfiable by sebastian/diff[3.0.2, 3.0.3, 3.0.4, 3.0.x-dev] from composer repo (https://repo.packagist.org) but sebastian/diff is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance.
Problem 1
Due to composer.json branch-alias: "dev-master": "3.0-dev" Fix change to "dev-main": "3.0-dev"