Update retrospective_process_group

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

{
  "data": {
    "id": "1b7f95d7-b262-45dd-9a6f-ccb25e3b7eeb",
    "type": "retrospective_process_groups",
    "attributes": {
      "retrospective_process_id": "64d2e995-14b6-4278-b312-2a952edccf8f",
      "sub_status_id": "b4b77187-8c3e-44c3-bba0-cb067c4b685d",
      "position": 1,
      "updated_at": "2025-03-19T07:54:27.085-07:00",
      "created_at": "2025-03-19T07:54:27.085-07:00"
    },
    "relationships": {
      "retrospective_process_group_steps": {
        "data": []
      }
    }
  }
}