[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 dc44286...217f929:
  > 217f929 upgrade to latest dependencies (# 749)
  > 1656ace upgrade to latest dependencies (# 748)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.58%. Comparing base (a043ddf) to head (3902f96).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15355      +/-   ##
==========================================
- Coverage   84.59%   84.58%   -0.02%     
==========================================
  Files         219      219              
  Lines       13584    13584              
==========================================
- Hits        11492    11490       -2     
- Misses       1725     1727       +2     
  Partials      367      367              

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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
istio-latest-no-mesh-tls_serving_main	3902f96	link	true	/test istio-latest-no-mesh-tls

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