Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires php ^8.1 but your php version (8.0; overridden via config.platform, actual: 8.0.30) does not satisfy that requirement.
Problem 2
- Root composer.json requires silverstripe/installer 5.1.x-dev -> satisfiable by silverstripe/installer[5.1.x-dev].
- silverstripe/installer 5.1.x-dev requires php ^8.1 -> your php version (8.0; overridden via config.platform, actual: 8.0.30) does not satisfy that requirement.
Problem 3
- silverstripe/framework[5.0.17, ..., 5.x-dev] require php ^8.1 -> your php version (8.0; overridden via config.platform, actual: 8.0.30) does not satisfy that requirement.
- Root composer.json requires silverstripe/framework ^5.0.17 -> satisfiable by silverstripe/framework[5.0.17, ..., 5.x-dev].