[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 dbc2260...a7df3f8:
  > a7df3f8 Update community files (# 1027)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (906d309) 85.91% compared to head (99ee2f8) 85.92%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14814      +/-   ##
==========================================
+ Coverage   85.91%   85.92%   +0.01%     
==========================================
  Files         197      197              
  Lines       14991    14991              
==========================================
+ Hits        12879    12881       +2     
+ Misses       1798     1795       -3     
- Partials      314      315       +1     

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