Update a retention policy

curl --request PUT \
  --url https://api-sandbox.featherhq.com/v1/retention-policies/{policy_id} \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "name": "<string>",
  "turn_retention_days": 123,
  "session_retention_days": 123,
  "is_default": true
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "is_default": true,
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "turn_retention_days": 123,
  "session_retention_days": 123
}