[Automated] Update net-gateway-api nightly

[knative-automation]

/assign @knative/serving-writers
/cc @knative/serving-writers

Produced via:

for x in net-gateway-api.yaml istio-gateway.yaml gateway-api.yaml; do
  curl https://storage.googleapis.com/knative-nightly/net-gateway-api/latest/$x > ${GITHUB_WORKSPACE}/./third_party/gateway-api-latest/$x
done

Details:

bumping knative.dev/net-gateway-api 42d5136...2dff2a7:
  > 2dff2a7 Add consistent SECURITY.md (# 584)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aec0c3b) 86.04% compared to head (3594444) 86.04%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14642      +/-   ##
==========================================
- Coverage   86.04%   86.04%   -0.01%     
==========================================
  Files         197      197              
  Lines       14929    14929              
==========================================
- Hits        12846    12845       -1     
+ Misses       1774     1773       -1     
- Partials      309      311       +2     

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