[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 21ff32e...046d42b:
  > 046d42b upgrade to latest dependencies (# 951)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02% 🎉

Comparison is base (aeb4e94) 86.10% compared to head (c3ac6c9) 86.13%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14339      +/-   ##
==========================================
+ Coverage   86.10%   86.13%   +0.02%     
==========================================
  Files         196      196              
  Lines       14781    14781              
==========================================
+ Hits        12727    12731       +4     
+ Misses       1747     1745       -2     
+ Partials      307      305       -2     

see 3 files with indirect coverage changes

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[psschwei]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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