[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 a21cc34...9a51ff3:
  > 9a51ff3 upgrade to latest dependencies (# 1252)
  > 772bb7e upgrade to latest dependencies (# 1251)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d89c70) 85.84% compared to head (3d7986c) 85.86%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14843      +/-   ##
==========================================
+ Coverage   85.84%   85.86%   +0.01%     
==========================================
  Files         198      198              
  Lines       15117    15117              
==========================================
+ Hits        12977    12980       +3     
+ Misses       1820     1817       -3     
  Partials      320      320              

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