[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 446def7...3ff14fe:
  > 3ff14fe Update community files (# 1316)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.78%. Comparing base (28dff5c) to head (1f7d07d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15680      +/-   ##
==========================================
- Coverage   80.81%   80.78%   -0.04%     
==========================================
  Files         222      222              
  Lines       18034    18034              
==========================================
- Hits        14574    14568       -6     
- Misses       3089     3093       +4     
- Partials      371      373       +2     

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