[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 26604bc...5d8f1a7:
  > 5d8f1a7 Update community files (# 1386)

[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 80.05%. Comparing base (54868c2) to head (824e2e1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16175      +/-   ##
==========================================
- Coverage   80.08%   80.05%   -0.03%     
==========================================
  Files         214      214              
  Lines       16940    16940              
==========================================
- Hits        13566    13561       -5     
- Misses       3015     3018       +3     
- Partials      359      361       +2     

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