test: enable retry on errors

[bcoe]

Try out the new retryErrors setting.

[tmatsuo]

still failing:

Error: Detected 5 broken links.
 docs/
   [0] https://console.cloud.google.com/flows/enableapi?apiid=aiplatform.googleapis.com
   [0] https://cloud.google.com/docs/authentication/getting-started
   [0] https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-ai-platform&page=editor&open_in_editor=samples/cancel-custom-job.js,samples/README.md
   [0] https://gstatic.com/cloudssh/images/open-btn.png
   [0] https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-ai-platform&page=editor&open_in_editor=samples/cancel-batch-prediction-job.js,samples/README.md

[bcoe]

@tmatsuo it turned out Justin hadn't yet released the new version of the action, will run again a few times and make sure it remains green.

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• .github/workflows/ci.yaml - .github/workflows/ci.yaml (GitHub Actions) should be updated in synthtool