Update net-istio nightly (#11927)
Update net-istio nightly (#11927)

bumping knative.dev/net-istio 6f9ccce...bde06b0:
  > bde06b0 upgrade to latest dependencies (# 748)

Signed-off-by: Knative Automation <f415700d4d0ce1c81810fe7553e3eea2bed16231@knative.team>
knative/serving,knative/serving