Update go to 1.13 in go.mod (#18784)
Update go to 1.13 in go.mod (#18784)


istio/istio,smawson/istio,istio/istio,smawson/istio,smawson/istio,istio/istio,smawson/istio,istio/istio,istio/istio,smawson/istio,smawson/istio