drop vendor licenses

[dprotaso]

Part of knative/community#1441

/assign @cardil

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.93%. Comparing base (d21ec14) to head (5b4c83b).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #657   +/-   ##
=======================================
  Coverage   66.93%   66.93%           
=======================================
  Files          15       15           
  Lines         862      862           
=======================================
  Hits          577      577           
  Misses        254      254           
  Partials       31       31           

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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