[TASK] Apply recommended testing structure - #18

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires typo3/minimal ^14.0 -> satisfiable by typo3/minimal[v14.0.0]. - typo3/minimal v14.0.0 requires typo3/cms-core ^14.0 -> found typo3/cms-core[v14.0.0, ..., v14.2.0] but it conflicts with your root composer.json require (^13.4).