Update group

curl --request PUT \
  --url https://cookiechimp.com/api/v1/groups/{id} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "<string>",
  "external_id": "<string>"
}'

{
  "id": "abc123",
  "name": "Example Ltd",
  "external_id": "ABC_123",
  "partner": "partner_one",
  "max_pageviews_per_month": 500000
}