[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 b4c1a5c...806915f:
  > 806915f Update community files (# 719)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: knative-automation
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.77%. Comparing base (c2d0af1) to head (e560639).
Report is 78 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15173      +/-   ##
==========================================
+ Coverage   84.11%   84.77%   +0.66%     
==========================================
  Files         213      218       +5     
  Lines       16783    13469    -3314     
==========================================
- Hits        14117    11419    -2698     
+ Misses       2315     1683     -632     
- Partials      351      367      +16     

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[ReToCode]

/test istio-latest-no-mesh