[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 0d9e460...a52b769:
  > a52b769 upgrade to latest dependencies (# 1125)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.47%. Comparing base (6fe1b33) to head (2aea32d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15471      +/-   ##
==========================================
- Coverage   84.50%   84.47%   -0.03%     
==========================================
  Files         219      219              
  Lines       13608    13608              
==========================================
- Hits        11499    11496       -3     
- Misses       1739     1741       +2     
- Partials      370      371       +1     

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