[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 50feeb8...af388f6:
  > af388f6 upgrade to latest dependencies (# 1272)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.57%. Comparing base (8a99187) to head (cc5b559).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15402      +/-   ##
==========================================
- Coverage   84.58%   84.57%   -0.01%     
==========================================
  Files         219      219              
  Lines       13587    13587              
==========================================
- Hits        11492    11491       -1     
- Misses       1727     1729       +2     
+ Partials      368      367       -1     

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