Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires drupal/core-recommended ^10.3 -> satisfiable by drupal/core-recommended[10.3.0-beta1, ..., 10.5.x-dev]. - Root composer.json requires phpspec/prophecy-phpunit ^2 -> satisfiable by phpspec/prophecy-phpunit[v2.0.0, ..., 2.x-dev]. - drupal/core-recommended[10.3.0-beta1, ..., 10.5.x-dev] require symfony/serializer ~v6.4.7 -> satisfiable by symfony/serializer[v6.4.7, ..., 6.4.x-dev]. - Conclusion: don't install symfony/serializer v6.4.13 (conflict analysis result)

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/