[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 4eb3dbe...c3b40f9:
  > c3b40f9 upgrade to latest dependencies (# 1286)

[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 80.27%. Comparing base (42d556e) to head (c41a30e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16607      +/-   ##
==========================================
+ Coverage   80.22%   80.27%   +0.05%     
==========================================
  Files         217      217              
  Lines       13568    13568              
==========================================
+ Hits        10885    10892       +7     
+ Misses       2316     2311       -5     
+ Partials      367      365       -2     

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