[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 c74d962...20cce8f:
  > 20cce8f upgrade to latest dependencies (# 1554)

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.24%. Comparing base (42d556e) to head (2d508db).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16610      +/-   ##
==========================================
+ Coverage   80.22%   80.24%   +0.02%     
==========================================
  Files         217      217              
  Lines       13568    13568              
==========================================
+ Hits        10885    10888       +3     
+ Misses       2316     2315       -1     
+ Partials      367      365       -2     

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[knative-prow]

@knative-automation: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
istio-latest-no-mesh_serving_main	2d508db	link	true	/test istio-latest-no-mesh

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