Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires mammatus/cron-attributes dev-590d197be16ab755cb3a3e2fa5752b11e08558d1, found mammatus/cron-attributes[dev-main] but it does not match the constraint.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires mammatus/cron-attributes dev-main -> satisfiable by mammatus/cron-attributes[dev-main]. - mammatus/cron-attributes dev-main requires mammatus/kubernetes-contracts dev-main -> found mammatus/kubernetes-contracts[dev-main] but it does not match your minimum-stability.