message: fix: update standalone to 1.91.0
diff: import chalk = require('chalk');
  // Get latest version from https://github.com/pact-foundation/pact-ruby-standalone/releases
  -export const PACT_STANDALONE_VERSION = '1.89.02-rc1';
  +export const PACT_STANDALONE_VERSION = '1.91.0';
  function throwError(msg: string): never {
  throw new Error(chalk.red(`Error while locating pact binary: ${msg}`));
  