[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 964f1c7...64b0aed:
  > 64b0aed upgrade to latest dependencies (# 1361)

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.25%. Comparing base (95b1ace) to head (f6b4ef5).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15985   +/-   ##
=======================================
  Coverage   80.24%   80.25%           
=======================================
  Files         214      214           
  Lines       16904    16904           
=======================================
+ Hits        13565    13566    +1     
- Misses       2975     2978    +3     
+ Partials      364      360    -4     

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