[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 ab6c876...2fba398:
  > 2fba398 Update community files (# 1141)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.50%. Comparing base (64b8325) to head (a4036f0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15604      +/-   ##
==========================================
- Coverage   83.53%   83.50%   -0.04%     
==========================================
  Files         219      219              
  Lines       17427    17427              
==========================================
- Hits        14558    14552       -6     
- Misses       2497     2503       +6     
  Partials      372      372              

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