🧹 Migrate to knative.dev/client-pkg

[cardil]

Changes

• 🧹 Migrate to client pkg (incorporates changes from Replace knative.dev/client references with knative.dev/client-pkg #255, thanks @vyasgun)

/kind cleanup

Closes #255

[codecov]

Codecov Report

Merging #260 (38f161e) into main (5c64035) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #260   +/-   ##
=======================================
  Coverage   68.17%   68.17%           
=======================================
  Files          35       35           
  Lines        1128     1128           
=======================================
  Hits          769      769           
  Misses        299      299           
  Partials       60       60           

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[psschwei]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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