[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 a0a145d...f9aab23:
  > f9aab23 upgrade to latest dependencies (# 1178)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.99%. Comparing base (0cb5678) to head (736ea79).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15872      +/-   ##
==========================================
+ Coverage   80.95%   80.99%   +0.03%     
==========================================
  Files         210      210              
  Lines       16731    16731              
==========================================
+ Hits        13545    13551       +6     
+ Misses       2837     2831       -6     
  Partials      349      349              

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