curl --request GET \
  --url https://gogs.example.com/api/v1/repos/{owner}/{repo}/milestones/{id} \
  --header 'Authorization: <api-key>'

{
  "id": 123,
  "state": "open",
  "title": "<string>",
  "description": "<string>",
  "open_issues": 123,
  "closed_issues": 123,
  "closed_at": "2023-11-07T05:31:56Z",
  "due_on": "2023-11-07T05:31:56Z"
}