[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 66047dc...a85d044:
  > a85d044 upgrade to latest dependencies (# 1377)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.54%. Comparing base (6a27004) to head (75178d6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15584      +/-   ##
==========================================
- Coverage   83.57%   83.54%   -0.04%     
==========================================
  Files         219      219              
  Lines       17421    17421              
==========================================
- Hits        14560    14554       -6     
- Misses       2491     2496       +5     
- Partials      370      371       +1     

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[ReToCode]

/lgtm
/approve

[knative-prow]

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