Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires contao/manager-bundle ^2.8, found contao/manager-bundle[4.3.0, ..., 4.13.x-dev, 5.0.0-RC1, ..., 5.x-dev] but it does not match the constraint.
Problem 2
- contao/core-bundle[4.13.0, ..., 4.13.46] require symfony/config ^5.4 -> found symfony/config[v5.4.0, ..., v5.4.40] but it conflicts with your root composer.json require (^6.4).
- Root composer.json requires contao/core-bundle ~4.13.0 -> satisfiable by contao/core-bundle[4.13.0, ..., 4.13.46].