[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 22f1c55...a3308ae:
  > a3308ae upgrade to latest dependencies (# 1306)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.55%. Comparing base (95d2c9b) to head (dfef69d).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15612      +/-   ##
==========================================
- Coverage   83.55%   83.55%   -0.01%     
==========================================
  Files         219      219              
  Lines       17427    17427              
==========================================
- Hits        14562    14561       -1     
- Misses       2495     2496       +1     
  Partials      370      370              

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[ReToCode]

/retest

[ReToCode]

/test istio-latest-no-mesh