[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 4dff29e...60ebc8f:
  > 60ebc8f Update community files (# 1402)

[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 80.89%. Comparing base (72500e7) to head (50798bf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15727      +/-   ##
==========================================
+ Coverage   80.84%   80.89%   +0.04%     
==========================================
  Files         222      222              
  Lines       18070    18070              
==========================================
+ Hits        14609    14617       +8     
+ Misses       3088     3083       -5     
+ Partials      373      370       -3     

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