[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 e2fc773...cf4988a:
  > cf4988a  Add envoy gateway testing (# 738)
  > 7f1100e upgrade to latest dependencies (# 744)

[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 84.78%. Comparing base (c980773) to head (b2a8011). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15335 +/- ## ========================================== - Coverage 84.80% 84.78% -0.02% ========================================== Files 218 218 Lines 13508 13508 ========================================== - Hits 11455 11453 -2 Misses 1687 1687 - Partials 366 368 +2 ```

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[dprotaso]

/retest