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'
  }

Start in PRChecker.checkGitHubCI() and inspect how commit.checkSuites.nodes is interpreted, using the linked PR, action attempt, and git-node land output as reproduction context. Verify behavior when the latest GitHub Actions run is cancelled after earlier successful runs. Done means the reported CI state and error message accurately reflect that case, with tests covering it.