[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 7970535...9823ac5:
  > 9823ac5 upgrade to latest dependencies (# 1283)

[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 84.20%. Comparing base (0e9c192) to head (c785550).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14987      +/-   ##
==========================================
- Coverage   84.22%   84.20%   -0.02%     
==========================================
  Files         213      213              
  Lines       16633    16633              
==========================================
- Hits        14009    14006       -3     
- Misses       2279     2280       +1     
- Partials      345      347       +2     

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