Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires php >=8.0 but your php version (7.4.33) does not satisfy that requirement.
Problem 2
- Root composer.json requires mantle-framework/testkit ^0.12.7 -> satisfiable by mantle-framework/testkit[v0.12.7].
- mantle-framework/testkit v0.12.7 requires php ^8.0 -> your php version (7.4.33) does not satisfy that requirement.
attackant