List a cover letter's versions

[
  {
    "id": "<string>",
    "kind": "created",
    "name": "<string>",
    "createdAt": "2026-08-10T12:00:00Z"
  }
]

{
  "defined": true,
  "code": "<string>",
  "status": 1,
  "message": "<string>",
  "data": null
}