[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 f3e4e0c...4df21ed:
  > 4df21ed Add IPv6 support for Kourier (# 1455)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.26%. Comparing base (dbaab46) to head (abbe85f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16595      +/-   ##
==========================================
+ Coverage   80.22%   80.26%   +0.04%     
==========================================
  Files         217      217              
  Lines       13568    13568              
==========================================
+ Hits        10885    10891       +6     
+ Misses       2317     2314       -3     
+ Partials      366      363       -3     

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