[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 b464a0a...aac48c6:
  > aac48c6 upgrade to latest dependencies (# 1107)

[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 84.61%. Comparing base (1dff15d) to head (9ad9020).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15356      +/-   ##
==========================================
+ Coverage   84.59%   84.61%   +0.01%     
==========================================
  Files         219      219              
  Lines       13584    13584              
==========================================
+ Hits        11492    11494       +2     
+ Misses       1726     1724       -2     
  Partials      366      366              

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