chore: fix wasm stats test

[zirain]

Before this would pass if CPU is 4 core.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.17%. Comparing base (aaa5569) to head (3df1ab9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9657      +/-   ##
==========================================
- Coverage   76.19%   76.17%   -0.02%     
==========================================
  Files         261      261              
  Lines       43528    43528              
==========================================
- Hits        33164    33158       -6     
- Misses       8161     8166       +5     
- Partials     2203     2204       +1     

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