Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires typo3/testing-framework dev-main -> satisfiable by typo3/testing-framework[dev-main]. - typo3/testing-framework dev-main requires typo3/cms-core 13.*.*@dev -> found typo3/cms-core[v13.0.0, ..., v13.2.1] but it conflicts with your root composer.json require (^12.4).

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/