[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 0e8fac1...5a15a5f:
  > 5a15a5f Update community files (# 1215)

[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 80.06%. Comparing base (7c31784) to head (f6a90ad).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16214      +/-   ##
==========================================
+ Coverage   80.03%   80.06%   +0.03%     
==========================================
  Files         214      214              
  Lines       13313    13313              
==========================================
+ Hits        10655    10659       +4     
+ Misses       2299     2293       -6     
- Partials      359      361       +2     

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[dprotaso]

/retest