fix(cdk-diff): install pnpm [CLK-252116]

[ahammond]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.37%. Comparing base (bd54d45) to head (6c64a43).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #267   +/-   ##
=======================================
  Coverage   99.37%   99.37%           
=======================================
  Files          17       17           
  Lines        2240     2256   +16     
  Branches       88      137   +49     
=======================================
+ Hits         2226     2242   +16     
  Misses         14       14           

Files	Coverage Δ
src/cdk-diff-workflow.ts	100.00% <100.00%> (ø)

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