Replicate Get the signing secret for the default webhook

Get the signing secret for the default webhook endpoint. This is used to verify that webhook requests are coming from Replicate. Example cURL request: ```console curl -s \ -H "Authorization: Bearer $REPLICATE_API_TOKEN" \ https://api.replicate.com/v1/webhooks/default/secret ``` The response will be a JSON object with a `key` property: ```json { "key": "..." } ```