Update Contact List

curl --request PUT \
  --url https://api.kallabot.com/contacts/{list_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "contacts": [
    {
      "phone_number": "<string>",
      "template_variables": {}
    }
  ]
}'

{
  "status": "<string>",
  "message": "<string>",
  "list_id": "<string>",
  "total_contacts": 123,
  "contact_ids": [
    "<string>"
  ]
}