[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 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 a501be7...3642f6a:
  > 3642f6a bump istio to 1.20.3 and gateway api to v1 (# 627)
  > 3710fac upgrade to latest dependencies (# 628)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.20%. Comparing base (8a727cd) to head (149adc3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14946      +/-   ##
==========================================
- Coverage   84.25%   84.20%   -0.05%     
==========================================
  Files         213      213              
  Lines       16635    16635              
==========================================
- Hits        14016    14008       -8     
- Misses       2275     2280       +5     
- Partials      344      347       +3     

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