[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 8aa9d20...b88feea:
  > b88feea Update community files (# 762)
  > 1eb933b Bump golang.org/x/time from 0.5.0 to 0.6.0 (# 759)
  > 6720bce Use shared go set-up action (# 761)

[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 84.46%. Comparing base (c2789f2) to head (0a5144e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15456      +/-   ##
==========================================
- Coverage   84.48%   84.46%   -0.03%     
==========================================
  Files         219      219              
  Lines       13605    13605              
==========================================
- Hits        11494    11491       -3     
  Misses       1741     1741              
- Partials      370      373       +3     

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