[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 a53e9bf...4830ac2:
  > 4830ac2 Update community files (# 1161)

[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 80.84%. Comparing base (bb3d521) to head (522674a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15734      +/-   ##
==========================================
+ Coverage   80.81%   80.84%   +0.03%     
==========================================
  Files         222      222              
  Lines       18070    18070              
==========================================
+ Hits        14603    14609       +6     
+ Misses       3093     3090       -3     
+ Partials      374      371       -3     

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