Retrieves a secret

curl --request GET \
  --url https://api.rootly.com/v1/secrets/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "0e87aeae-1428-428d-a78c-f5d3d618ef69",
    "type": "secrets",
    "attributes": {
      "kind": "built_in",
      "name": "tfybzpvcrv",
      "secret": "[REDACTED]",
      "hashicorp_vault_mount": "secret",
      "hashicorp_vault_path": null,
      "hashicorp_vault_version": 0,
      "created_at": "2025-10-20T08:34:30.491-07:00",
      "updated_at": "2025-10-20T08:34:30.491-07:00"
    }
  }
}