[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[bot]]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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