Your requirements could not be resolved to an installable set of packages. Problem 1 - league/commonmark[2.0.0, ..., 2.4.1] require php ^7.4 || ^8.0 -> your php version (7.3.33) does not satisfy that requirement. - Root composer.json requires league/commonmark ^2.0.0 -> satisfiable by league/commonmark[2.0.0, ..., 2.4.1].

The process '/usr/local/bin/composer' failed with exit code 2

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, ramsey/composer-install@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/