Bump Contour to v1.28.3

[izabelacg]

Changes

• Bump Contour to v1.28.3

[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, izabelacg

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.92%. Comparing base (820cd7c) to head (8008ab8).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1074      +/-   ##
==========================================
- Coverage   94.06%   93.92%   -0.14%     
==========================================
  Files          11       11              
  Lines         893      708     -185     
==========================================
- Hits          840      665     -175     
+ Misses         32       22      -10     
  Partials       21       21              

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