[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 cbe3c11...7fc220b:
  > 7fc220b use chainguard image (# 1101)
  > 5a3e504 upgrade to latest dependencies (# 1103)

[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 84.79%. Comparing base (4a6c5fc) to head (d8efdcd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15322      +/-   ##
==========================================
- Coverage   84.81%   84.79%   -0.02%     
==========================================
  Files         218      218              
  Lines       13504    13504              
==========================================
- Hits        11453    11451       -2     
- Misses       1685     1687       +2     
  Partials      366      366              

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[ReToCode]

/test upgrade-tests