[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 918ac84...b3841b5:
  > b3841b5 upgrade to latest dependencies (# 1453)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.21%. Comparing base (8ac221f) to head (524eea1).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16588      +/-   ##
==========================================
- Coverage   80.22%   80.21%   -0.01%     
==========================================
  Files         217      217              
  Lines       13545    13545              
==========================================
- Hits        10866    10865       -1     
  Misses       2317     2317              
- Partials      362      363       +1     

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