Update net-contour nightly (#12964)
Update net-contour nightly (#12964)

bumping knative.dev/net-contour 8605078...3ef2056:
  > 3ef2056 upgrade to latest dependencies (# 763)
  > bf2eeaa Update actions (# 765)

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