[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 ab403a9...3931599:
  > 3931599 Update community files (# 644)
  > e79b1f3 upgrade to latest dependencies (# 647)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.07%. Comparing base (ffd2796) to head (f7a9e57).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15022   +/-   ##
=======================================
  Coverage   84.07%   84.07%           
=======================================
  Files         213      213           
  Lines       16796    16796           
=======================================
  Hits        14121    14121           
+ Misses       2321     2320    -1     
- Partials      354      355    +1     

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[knative-prow]

@knative-automation: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
gateway-api-latest-and-contour_serving_main	f7a9e57	link	false	/test gateway-api-latest-and-contour

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