Your requirements could not be resolved to an installable set of packages. Problem 1 - phpunit/phpunit[9.6.20, ..., 9.6.x-dev] require sebastian/diff ^4.0.6 -> satisfiable by sebastian/diff[4.0.6, 4.0.x-dev]. - phpunit/phpunit[9.5.0, ..., 9.6.19] require sebastian/diff ^4.0.3 -> satisfiable by sebastian/diff[4.0.3, ..., 4.0.x-dev]. - You can only install one version of a package, so only one of these can be installed: sebastian/diff[3.0.0, ..., 3.0.x-dev, 4.0.0, ..., 4.0.x-dev, 5.0.0, ..., 5.1.x-dev, 6.0.0, 6.0.1, 6.0.2, 6.0.x-dev]. - silverstripe/framework 6.x-dev requires sebastian/diff ^6.0 -> satisfiable by sebastian/diff[6.0.0, 6.0.1, 6.0.2, 6.0.x-dev]. - Root composer.json requires silverstripe/framework ^6 -> satisfiable by silverstripe/framework[6.x-dev]. - Root composer.json requires phpunit/phpunit ^9.5 -> satisfiable by phpunit/phpunit[9.5.0, ..., 9.6.x-dev].

Process completed with exit code 2.

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab, shivammathur/setup-php@1a18b2267f80291a81ca1d33e7c851fe09e7dfc4, actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8, actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/