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 93.43%. Comparing base (ae03989) to head (e373027).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #954   +/-   ##
=======================================
  Coverage   93.43%   93.43%           
=======================================
  Files          36       36           
  Lines        1249     1249           
=======================================
  Hits         1167     1167           
  Misses         69       69           
  Partials       13       13           

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[dprotaso]

This needs to merge first - #953

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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