[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 bdbf4da...5ffdaff:
  > 5ffdaff upgrade to latest dependencies (# 1562)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.29%. Comparing base (516bc43) to head (31ecb41).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16640      +/-   ##
==========================================
- Coverage   80.36%   80.29%   -0.07%     
==========================================
  Files         217      217              
  Lines       13568    13568              
==========================================
- Hits        10904    10895       -9     
- Misses       2301     2311      +10     
+ Partials      363      362       -1     

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