[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 8c9f69b...7ce2d13:
  > 7ce2d13 upgrade to latest dependencies (# 793)
  > dbddc32 Update community files (# 792)
  > 6ffe72f upgrade to latest dependencies (# 788)
  > 9734fb9 Bump Kind and k8s version (# 790)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.53%. Comparing base (750f9a2) to head (8fa5ca6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15658      +/-   ##
==========================================
+ Coverage   83.51%   83.53%   +0.02%     
==========================================
  Files         219      219              
  Lines       17427    17427              
==========================================
+ Hits        14554    14558       +4     
+ Misses       2500     2497       -3     
+ Partials      373      372       -1     

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[dprotaso]

/retest