[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 242953e...523ecde:
  > 523ecde Adjust README dropping indication that this is not production ready (# 806)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.79%. Comparing base (6265a8e) to head (0f83240).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15723      +/-   ##
==========================================
- Coverage   80.84%   80.79%   -0.05%     
==========================================
  Files         222      222              
  Lines       18070    18070              
==========================================
- Hits        14609    14600       -9     
- Misses       3089     3096       +7     
- Partials      372      374       +2     

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