Your requirements could not be resolved to an installable set of packages. Problem 1 - pestphp/pest v3.0.8 requires pestphp/pest-plugin-mutate ^3.0.3 -> satisfiable by pestphp/pest-plugin-mutate[v3.0.3, v3.0.4, 3.x-dev] from composer repo (https://repo.packagist.org) but pestphp/pest-plugin-mutate is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - pestphp/pest[v3.1.0, ..., 3.x-dev] require pestphp/pest-plugin-mutate ^3.0.4 -> satisfiable by pestphp/pest-plugin-mutate[v3.0.4, 3.x-dev] from composer repo (https://repo.packagist.org) but pestphp/pest-plugin-mutate is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - Root composer.json requires pestphp/pest ^3.0.8 -> satisfiable by pestphp/pest[v3.0.8, v3.1.0, 3.x-dev].

Process completed with exit code 2.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/