[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 e2b46fb...51e9efb:
  > 51e9efb upgrade to latest dependencies (# 1527)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Details

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.20%. Comparing base (b3d77f2) to head (18775a5).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16467   +/-   ##
=======================================
  Coverage   80.20%   80.20%           
=======================================
  Files         217      217           
  Lines       13533    13533           
=======================================
  Hits        10854    10854           
+ Misses       2314     2313    -1     
- Partials      365      366    +1     

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[dprotaso]

/retest