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 78.68%. Comparing base (b8b7ca1) to head (661da9a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3001   +/-   ##
=======================================
  Coverage   78.68%   78.68%           
=======================================
  Files         188      188           
  Lines       11051    11051           
=======================================
  Hits         8695     8695           
  Misses       2092     2092           
  Partials      264      264           

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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