[Automated] Update net-contour nightly

[knative-automation]

/assign @knative/serving-writers
/cc @knative/serving-writers

Produced via:

for x in net-contour.yaml contour.yaml; do
  curl https://storage.googleapis.com/knative-nightly/net-contour/latest/$x > ${GITHUB_WORKSPACE}/./third_party/contour-latest/$x
done

Details:

bumping knative.dev/net-contour 4b7988f...577c757:
  > 577c757 upgrade to latest dependencies (# 1300)

[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 80.31%. Comparing base (ffaaaf7) to head (802ebe5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16683   +/-   ##
=======================================
  Coverage   80.31%   80.31%           
=======================================
  Files         217      217           
  Lines       13560    13560           
=======================================
  Hits        10891    10891           
  Misses       2306     2306           
  Partials      363      363           

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