[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 e588e72...70a257f:
  > 70a257f upgrade to latest dependencies (# 1115)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.58%. Comparing base (8a99187) to head (9fd37c0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15400   +/-   ##
=======================================
  Coverage   84.58%   84.58%           
=======================================
  Files         219      219           
  Lines       13587    13587           
=======================================
+ Hits        11492    11493    +1     
+ Misses       1727     1726    -1     
  Partials      368      368           

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[dprotaso]

/lgtm
/approve

known flake

#15134

[dprotaso]

/retest

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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