[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 87cb472...23d7e3a:
  > 23d7e3a Update community files (# 776)
  > 5b5f08e Update community files (# 775)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.47%. Comparing base (2a87ffd) to head (ba532a7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15566      +/-   ##
==========================================
+ Coverage   84.45%   84.47%   +0.02%     
==========================================
  Files         219      219              
  Lines       13608    13608              
==========================================
+ Hits        11492    11496       +4     
+ Misses       1744     1742       -2     
+ Partials      372      370       -2     

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