[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 b227314...a71545e:
  > a71545e upgrade to latest dependencies (# 1263)

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.19%. Comparing base (8ebc4a3) to head (d9ab261).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16491      +/-   ##
==========================================
- Coverage   80.22%   80.19%   -0.03%     
==========================================
  Files         217      217              
  Lines       13547    13547              
==========================================
- Hits        10868    10864       -4     
- Misses       2313     2317       +4     
  Partials      366      366              

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