[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 d661174...3cf7632:
  > 3cf7632 Allow to disable envoy server header injection (# 1311)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.58%. Comparing base (5717d19) to head (a0a68f0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15647      +/-   ##
==========================================
+ Coverage   83.53%   83.58%   +0.04%     
==========================================
  Files         219      219              
  Lines       17427    17427              
==========================================
+ Hits        14558    14566       +8     
+ Misses       2498     2492       -6     
+ Partials      371      369       -2     

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