[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 b43b985...8c9f69b:
  > 8c9f69b Update community files (# 789)

[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 83.53%. Comparing base (5911aee) to head (501cda8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main   #15635       +/-   ##
=========================================
+ Coverage      0   83.53%   +83.53%     
=========================================
  Files         0      219      +219     
  Lines         0    17427    +17427     
=========================================
+ Hits          0    14558    +14558     
- Misses        0     2498     +2498     
- Partials      0      371      +371     

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