Missing `display_title` field from `WorkflowRun`

[wheelerlaw]

The field display_title is missing from the WorkflowRun struct. It is part of the response body for various API endpoints that return an instance of a WorkflowRun.

The endpoint /repos/OWNER/REPO/actions/runs/RUN_ID has it shown in the docs:

{
  "id": 30433642,
  "name": "Build",
  "node_id": "MDEyOldvcmtmbG93IFJ1bjI2OTI4OQ==",
  "check_suite_id": 42,
  "check_suite_node_id": "MDEwOkNoZWNrU3VpdGU0Mg==",
  "head_branch": "main",
  "head_sha": "acb5820ced9479c074f688cc328bf03f341a511d",
  "path": ".github/workflows/build.yml@main",
  "run_number": 562,
  "event": "push",
  "display_title": "Update README.md",  <-------
  "status": "queued",
  "conclusion": null,
  "workflow_id": 159038,
  "url": "https://api.github.com/repos/octo-org/octo-repo/actions/runs/30433642",
  "html_url": "https://github.com/octo-org/octo-repo/actions/runs/30433642",
  "pull_requests": [],
  ...
}

It isn't shown in the docs for the endpoint /repos/OWNER/REPO/actions/runs but it's present in the actual response body.