Update net-kourier nightly (#11436)
Update net-kourier nightly (#11436)

bumping knative.dev/net-kourier 2ad5cf1...970ec28:
  > 970ec28 Update actions (# 532)
  > 1ff1503 upgrade to latest dependencies (# 531)

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