[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 8b2a6d2...3ef6af6:
  > 3ef6af6 Update community files (# 1281)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.52%. Comparing base (dc99c97) to head (d1d434e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15457   +/-   ##
=======================================
  Coverage   84.51%   84.52%           
=======================================
  Files         219      219           
  Lines       13605    13605           
=======================================
+ Hits        11498    11499    +1     
+ Misses       1737     1735    -2     
- Partials      370      371    +1     

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