Update an override shift

curl --request PUT \
  --url https://api.rootly.com/v1/override_shifts/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "shifts",
    "attributes": {
      "user_id": 123
    }
  }
}'

{
  "data": {
    "id": "aa55ce4c-b70d-40da-8b82-a6c19be0f9ba",
    "type": "shifts",
    "attributes": {
      "schedule_id": "5ee54753-f868-4f71-8fc7-b4e09f522aa8",
      "rotation_id": "988afc44-91fd-418d-ae26-8144826fc680",
      "starts_at": "2025-08-21T17:46:26.000-07:00",
      "ends_at": "2025-08-22T01:46:26.000-07:00",
      "is_override": true
    },
    "relationships": {
      "shift_override": {
        "data": {
          "id": "5fafb59c-5e0c-48b4-9bf8-63db81b91b01",
          "type": "shift_overrides"
        }
      },
      "user": {
        "data": {
          "id": "356",
          "type": "users"
        }
      }
    }
  }
}