[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 c7da63d...7bab616:
  > 7bab616 upgrade to latest dependencies (# 1121)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.48%. Comparing base (97e9e8d) to head (b17b04e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15445      +/-   ##
==========================================
- Coverage   84.49%   84.48%   -0.02%     
==========================================
  Files         219      219              
  Lines       13605    13605              
==========================================
- Hits        11496    11494       -2     
- Misses       1738     1740       +2     
  Partials      371      371              

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