Gem::GemcutterUtilities#add_otp_option

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/gemcutter_utilities.rb, line 35
def add_otp_option
  add_option("--otp CODE",
             "Digit code for multifactor authentication",
             "You can also use the environment variable GEM_HOST_OTP_CODE") do |value, options|
    options[:otp] = value
  end
end