Your requirements could not be resolved to an installable set of packages. Problem 1 - phpro/grumphp[v0.16.0, ..., v0.16.2] require composer-plugin-api ~1.0 -> found composer-plugin-api[2.2.0] but it does not match the constraint. - phpro/grumphp[v0.17.0, ..., v0.18.0] require php ^7.2 -> your php version (7.1.33) does not satisfy that requirement. - drupol/php-conventions[1.8.17, ..., 1.8.20] require php >= 7.2.3 -> your php version (7.1.33) does not satisfy that requirement. - drupol/php-conventions[1.7.4, ..., 1.7.5] require phpro/grumphp ^0.16.2 || ^0.17.2 -> satisfiable by phpro/grumphp[v0.16.2, v0.17.2]. - Root composer.json requires drupol/php-conventions ^1.7.1 -> satisfiable by drupol/php-conventions[1.7.4, ..., 1.8.20].

Process completed with exit code 1.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/cache@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/