[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 cf23442...26604bc:
  > 26604bc upgrade to latest dependencies (# 1385)

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.08%. Comparing base (ddfabee) to head (f02f401).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16160   +/-   ##
=======================================
  Coverage   80.08%   80.08%           
=======================================
  Files         214      214           
  Lines       16943    16943           
=======================================
  Hits        13569    13569           
+ Misses       3017     3016    -1     
- Partials      357      358    +1     

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[dprotaso]

/retest