[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 a9517c7...e6259b9:
  > e6259b9 upgrade to latest dependencies (# 1370)
  > 8d4a09e Use istio.sidecar.inject label instead of annotation (# 1369)
  > 34ed280 upgrade to latest dependencies (# 1368)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.43%. Comparing base (0ebef64) to head (f5d1136).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15533      +/-   ##
==========================================
- Coverage   84.49%   84.43%   -0.06%     
==========================================
  Files         219      219              
  Lines       13608    13608              
==========================================
- Hits        11498    11490       -8     
- Misses       1740     1745       +5     
- Partials      370      373       +3     

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[ReToCode]

/lgtm
/approve

[knative-prow]

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