curl -X PUT https://app.trypost.it/api/labels/c3d4e5f6-a7b8-9c0d-1e2f-3a4b5c6d7e8f \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Launch Day",
    "color": "#22c55e"
  }'

{
  "id": "c3d4e5f6-a7b8-9c0d-1e2f-3a4b5c6d7e8f",
  "name": "Launch Day",
  "color": "#22c55e",
  "created_at": "2025-01-10 08:00:00",
  "updated_at": "2025-01-10 09:00:00"
}