fix(example): fix parallel sort example

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[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 6 lines in your changes missing coverage. Please review.

Project coverage is 88.52%. Comparing base (05b0ad3) to head (241e3d4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
utils/pprof.go	78.57%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   88.88%   88.52%   -0.37%     
==========================================
  Files          12       13       +1     
  Lines         756      784      +28     
==========================================
+ Hits          672      694      +22     
- Misses         67       71       +4     
- Partials       17       19       +2     

Flag	Coverage Δ
unittests	88.52% <78.57%> (-0.37%)	⬇️

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