Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires typo3/cms-core ^12.5, found typo3/cms-core[dev-main, v8.7.7, ..., 8.7.x-dev, v9.0.0, ..., 9.5.x-dev, v10.0.0, ..., 10.4.x-dev, v11.0.0, ..., 11.5.x-dev, v12.0.0, ..., 12.4.x-dev, v13.0.0, ..., 13.4.x-dev, 14.0.x-dev (alias of dev-main)] but it does not match the constraint. Problem 2 - Root composer.json requires typo3/testing-framework ^6.16 -> satisfiable by typo3/testing-framework[6.16.0, ..., 6.16.10]. - typo3/testing-framework[6.16.0, ..., 6.16.10] require typo3/cms-core 10.*.*@dev || 11.*.*@dev -> found typo3/cms-core[v10.0.0, ..., v10.4.37, v11.0.0, ..., v11.5.41] but it conflicts with your root composer.json require (^12.5).

Process completed with exit code 2.