[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 d6de4d0...78b15a0:
  > 78b15a0 upgrade to latest dependencies (# 824)

[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 80.79%. Comparing base (636392e) to head (bb37dfd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15806      +/-   ##
==========================================
- Coverage   80.85%   80.79%   -0.07%     
==========================================
  Files         222      222              
  Lines       18075    18075              
==========================================
- Hits        14614    14603      -11     
- Misses       3092     3099       +7     
- Partials      369      373       +4     

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