Removes an upstream from a gateway
curl --request DELETE \
--url https://api.example.com/api/v1/gateways/{gateway_id}/upstreams/{upstream_id} \
--header 'Authorization: <authorization>'curl --request DELETE \
--url https://api.example.com/api/v1/gateways/{gateway_id}/upstreams/{upstream_id} \
--header 'Authorization: <authorization>'