Update Upstream

{
  "algorithm": "<string>",
  "created_at": "<string>",
  "gateway_id": "<string>",
  "health_checks": {
    "headers": {},
    "interval": 123,
    "passive": true,
    "path": "<string>",
    "threshold": 123
  },
  "id": "<string>",
  "name": "<string>",
  "tags": [
    "<string>"
  ],
  "targets": [
    {
      "credentials": {
        "allow_override": true,
        "aws_access_key_id": "<string>",
        "aws_secret_access_key": "<string>",
        "azure_client_id": "<string>",
        "azure_client_secret": "<string>",
        "azure_tenant_id": "<string>",
        "azure_use_managed_identity": true,
        "gcp_service_account_json": "<string>",
        "gcp_use_service_account": true,
        "header_name": "<string>",
        "header_value": "<string>",
        "param_location": "<string>",
        "param_name": "<string>",
        "param_value": "<string>"
      },
      "default_model": "<string>",
      "headers": {},
      "host": "<string>",
      "id": "<string>",
      "models": [
        "<string>"
      ],
      "path": "<string>",
      "port": 123,
      "priority": 123,
      "protocol": "<string>",
      "provider": "<string>",
      "tags": [
        "<string>"
      ],
      "weight": 123
    }
  ],
  "updated_at": "<string>"
}