[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 0a8a9bc...a53e9bf:
  > a53e9bf Update community files (# 1160)

[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 80.83%. Comparing base (72500e7) to head (edf1f9d).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15726      +/-   ##
==========================================
- Coverage   80.84%   80.83%   -0.02%     
==========================================
  Files         222      222              
  Lines       18070    18070              
==========================================
- Hits        14609    14606       -3     
- Misses       3088     3092       +4     
+ Partials      373      372       -1     

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