message: [tests] Retry fetch upon "ECONNREFUSED"
  CI failed due to this error code, which can be retried.
diff: @@ -14,6 +14,10 @@ async function fetchRetry(...args) {
  // request to https://api-gru1.vercel.com/v3/now/deployments/dpl_FBWWhpQomjgwjJLu396snLrGZYCm failed, reason:
  // connect ETIMEDOUT 18.228.143.224:443
  throw canRetry(error);
  + } else if (error.code === 'ECONNREFUSED') {
  + // request to https://test2020-dhdy1xrfa.vercel.app/blog/post-3 failed, reason:
  + // connect ECONNREFUSED 76.76.21.21:443
  + throw canRetry(error);
  } else if (error.code === 'ECONNRESET') {
  throw canRetry(error);
  }
  