message: fix: Correct the config for using custom ca file
  When behind a proxy that implements SSL interception the CA file was
  not being set correctly.
diff: @@ -164,7 +164,9 @@ function downloadFileRetry(
  'User-Agent': 'https://github.com/pact-foundation/pact-node',
  },
  strictSSL: config.read()['strict-ssl'],
  - ca,
  + agentOptions: {
  + ca: ca,
  + },
  })
  .on('error', (e: string) => reject(e))
  .on(
  