update Ruby versions to be equal to versions of rake-compiler-dock
update Ruby versions to be equal to versions of rake-compiler-dock

msgpack/msgpack-ruby,cosmo0920/msgpack-ruby,msgpack/msgpack-ruby,ojundt/msgpack-ruby,cosmo0920/msgpack-ruby,cosmo0920/msgpack-ruby,ojundt/msgpack-ruby,cosmo0920/msgpack-ruby,ojundt/msgpack-ruby,msgpack/msgpack-ruby,ojundt/msgpack-ruby