[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 contour-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 b88feea...aa1ece3:
  > aa1ece3 upgrade to latest dependencies (# 763)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.49%. Comparing base (64ac199) to head (313bdbb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15464      +/-   ##
==========================================
+ Coverage   84.47%   84.49%   +0.01%     
==========================================
  Files         219      219              
  Lines       13608    13608              
==========================================
+ Hits        11496    11498       +2     
+ Misses       1742     1740       -2     
  Partials      370      370              

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