[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 8937b65...87cb472:
  > 87cb472 upgrade to latest dependencies (# 774)
  > 0356276 Bump golang.org/x/time from 0.6.0 to 0.7.0 (# 772)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.50%. Comparing base (4eb2e08) to head (b860d8c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15559      +/-   ##
==========================================
+ Coverage   84.45%   84.50%   +0.04%     
==========================================
  Files         219      219              
  Lines       13608    13608              
==========================================
+ Hits        11493    11499       +6     
+ Misses       1742     1738       -4     
+ Partials      373      371       -2     

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