[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 a85d044...e860cb6:
  > e860cb6 Update community files (# 1378)

[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 83.54%. Comparing base (d792207) to head (972a56b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15591      +/-   ##
==========================================
+ Coverage   83.51%   83.54%   +0.02%     
==========================================
  Files         219      219              
  Lines       17421    17421              
==========================================
+ Hits        14549    14554       +5     
+ Misses       2499     2496       -3     
+ Partials      373      371       -2     

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