Update net-istio nightly (#11506)
Update net-istio nightly (#11506)

bumping knative.dev/net-istio 6f64f4c...82466a9:
  > 82466a9 Drop pin to k8s lib 0.19.7 (# 672)
  > 0a3f175 upgrade to latest dependencies (# 670)
  > f844811 upgrade to latest dependencies (# 669)
  > 7f402f2 Remove the unneeded code (# 668)
  > 7c2535a upgrade to latest dependencies (# 666)

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