[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 b88feea...aa1ece3:
  > aa1ece3 upgrade to latest dependencies (# 763)

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.49%. Comparing base (64ac199) to head (313bdbb).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15464 +/- ## ========================================== + Coverage 84.47% 84.49% +0.01% ========================================== Files 219 219 Lines 13608 13608 ========================================== + Hits 11496 11498 +2 + Misses 1742 1740 -2 Partials 370 370 ```

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