[Automated] Update net-istio nightly

[knative-automation]

/assign @knative/networking-wg-leads
/cc @knative/networking-wg-leads

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 5f5c8e9...5251947:
  > 5251947 bump istio manifests to 1.15.0 (# 982)

[codecov]

Codecov Report

Base: 86.50% // Head: 86.52% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (4ae2aa5) compared to base (2332731).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13328      +/-   ##
==========================================
+ Coverage   86.50%   86.52%   +0.02%     
==========================================
  Files         196      196              
  Lines       14544    14544              
==========================================
+ Hits        12581    12584       +3     
+ Misses       1664     1662       -2     
+ Partials      299      298       -1     

Impacted Files	Coverage Δ
pkg/reconciler/configuration/configuration.go	82.93% <0.00%> (-1.43%)	⬇️
pkg/autoscaler/statforwarder/leases.go	73.95% <0.00%> (+1.56%)	⬆️
pkg/reconciler/revision/background.go	92.72% <0.00%> (+1.81%)	⬆️

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[psschwei]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: knative-automation, psschwei

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