Cancelled GitHub CI rerun after success is treated as failure

PR: https://github.com/nodejs/node/pull/43085
Action rerun attempt: https://github.com/nodejs/node/actions/runs/2320332585/attempts/7
git-node land output: https://github.com/nodejs/node/pull/43085#issuecomment-1126858386

At the moment of landing, the latest run of that action was cancelled, there were 5 prior successful runs, and GitHub UI reported everything as green.
However, ncu treated it as Last GitHub CI failed error, which is either wrong (not sure if easily fixable, as it requires failproof checking previous attempts) or confusing (Last GitHub CI cancelled might be a better error message).

Details: in PRChecker.checkGitHubCI(), commit.checkSuites.nodes[2] for this case was

  {
    app: { slug: 'github-actions' },
    conclusion: 'CANCELLED',
    status: 'COMPLETED'
  }

从 PRChecker.checkGitHubCI() 开始，检查如何解释 commit.checkSuites.nodes，并使用关联的 PR、操作尝试和 git-node land 输出作为复现上下文。验证在之前的运行均成功后，最新的 GitHub Actions 运行被取消时的行为。完成的标准是，报告的 CI 状态和错误消息准确反映该情况，并且有覆盖该情况的测试。