[Automated] Update net-istio nightly

[knative-automation]

/assign @knative/serving-writers
/cc @knative/serving-writers

Produced via:

for x in net-istio.yaml; do
  curl https://storage.googleapis.com/knative-nightly/net-istio/latest/$x > ${GITHUB_WORKSPACE}/./third_party/istio-latest/$x
done

Details:

bumping knative.dev/net-istio 1d7f64f...b6af942:
  > b6af942 upgrade to latest dependencies (# 1366)

[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 84.43%. Comparing base (cde060b) to head (ae1f0cb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15511      +/-   ##
==========================================
- Coverage   84.47%   84.43%   -0.05%     
==========================================
  Files         219      219              
  Lines       13608    13608              
==========================================
- Hits        11496    11490       -6     
- Misses       1742     1746       +4     
- Partials      370      372       +2     

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[ReToCode]

/test istio-latest-no-mesh-tls