Gem::Commands::SetupCommand#check_ruby_version

# File tmp/rubies/ruby-3.3.0/lib/rubygems/commands/setup_command.rb, line 110
def check_ruby_version
  required_version = Gem::Requirement.new ">= 2.6.0"

  unless required_version.satisfied_by? Gem.ruby_version
    alert_error "Expected Ruby version #{required_version}, is #{Gem.ruby_version}"
    terminate_interaction 1
  end
end