drop use of deprecated knative.dev/networking/pkg

[dprotaso]

Part of knative/networking#1102

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.96%. Comparing base (480e31d) to head (44f0f1b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1492   +/-   ##
=======================================
  Coverage   81.96%   81.96%           
=======================================
  Files          23       23           
  Lines        1519     1519           
=======================================
  Hits         1245     1245           
  Misses        180      180           
  Partials       94       94           

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[linkvt]

/lgtm