Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phplist/core dev-ISSUE-337, found phplist/core[dev-feature/templates-domain-repository, dev-cleanup/document-running-phpunit-1, dev-dependabot/github_actions/dot-github/workflows/actions/download-artifact-4.1.7, dev-test/di, dev-wip/access-trait, dev-main, dev-models, dev-releases/4.0.0-alpha1, dev-ISSUE-344, dev-phplist3, v4.0.0-alpha1, ..., v4.0.0-alpha5, v5.0.0-alpha1, v5.0.0-alpha2, v5.0.1-alpha1] but it does not match the constraint.

Process completed with exit code 2.

Your workflow is using a version of actions/cache that is scheduled for deprecation, actions/cache@v2. Please update your workflow to use either v3 or v4 of actions/cache to avoid interruptions. Learn more: https://github.blog/changelog/2024-12-05-notice-of-upcoming-releases-and-breaking-changes-for-github-actions/#actions-cache-v1-v2-and-actions-toolkit-cache-package-closing-down

The Ubuntu-20.04 brownout takes place from 2025-02-01. For more details, see https://github.com/actions/runner-images/issues/11101