[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 f55ab3c...7eb80d6:
  > 7eb80d6 Use a different 'static' image that supports s390x and ppc (# 1353)

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: knative-automation Once this PR has been reviewed and has the lgtm label, please assign psschwei for approval. For more information see the Kubernetes Code Review Process.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.58%. Comparing base (7d318cd) to head (a125fb2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15412 +/- ## ========================================== - Coverage 84.60% 84.58% -0.02% ========================================== Files 219 219 Lines 13587 13587 ========================================== - Hits 11495 11493 -2 - Misses 1725 1727 +2 Partials 367 367 ```

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