[Automated] Update net-contour nightly

[knative-automation]

/assign @knative/networking-wg-leads
/cc @knative/networking-wg-leads

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 a971f5d...a248e38:
  > a248e38 Update community files (# 711)
  > 169ded4 drop dead/unused symlink (# 706)
  > d5cb481 upgrade to latest dependencies (# 710)

[codecov]

Codecov Report

Merging #12542 (cb10b22) into main (e648a2f) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #12542      +/-   ##
==========================================
- Coverage   87.53%   87.48%   -0.05%     
==========================================
  Files         195      195              
  Lines        9720     9720              
==========================================
- Hits         8508     8504       -4     
- Misses        928      931       +3     
- Partials      284      285       +1     

Impacted Files	Coverage Δ
pkg/autoscaler/statforwarder/forwarder.go	88.88% <0.00%> (-7.41%)	⬇️

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[dprotaso]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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