Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit =9.3.16 (exact version match), found phpunit/phpunit[dev-main, dev-issue-4321/new-xml-logfile-format, 3.7.0, ..., 3.7.38, 4.0.0, ..., 4.8.36, 5.0.0, ..., 5.7.27, 6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20, 8.0.0, ..., 8.5.x-dev, 9.0.0, ..., 9.6.x-dev, 10.0.0, ..., 10.5.x-dev, 11.0.x-dev (alias of dev-main)] but it does not match the constraint.

Process completed with exit code 2.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.