[Automated] Update net-kourier nightly

[knative-automation]

/assign @knative/serving-writers
/cc @knative/serving-writers

Produced via:

for x in kourier.yaml; do
  curl https://storage.googleapis.com/knative-nightly/net-kourier/latest/$x > ${GITHUB_WORKSPACE}/./third_party/kourier-latest/$x
done

Details:

bumping knative.dev/net-kourier 9cf9736...2901664:
  > 2901664 Update actions (# 1255)

[knative-prow]

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