[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 71023b7...cf879dd:
  > cf879dd Support for loading ExternalAuthzConfig from ConfigMap (# 1334)

[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 80.91%. Comparing base (92b23aa) to head (252f0bc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15901      +/-   ##
==========================================
+ Coverage   80.90%   80.91%   +0.01%     
==========================================
  Files         210      210              
  Lines       16778    16778              
==========================================
+ Hits        13574    13576       +2     
+ Misses       2850     2849       -1     
+ Partials      354      353       -1     

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[dsimansk]

/retest