chore: remove unnecessary unsafe in list mean/sum

[orlp]

No description provided.

[reswqa]

Much cleaner! 👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.30%. Comparing base (99ab9c0) to head (356a522).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15660      +/-   ##
==========================================
- Coverage   81.31%   81.30%   -0.01%     
==========================================
  Files        1373     1373              
  Lines      176254   176253       -1     
  Branches     2544     2544              
==========================================
- Hits       143320   143308      -12     
- Misses      32452    32463      +11     
  Partials      482      482              

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[codspeed-hq]

CodSpeed Performance Report

Merging #15660 will improve performances by 10.24%

_{Comparing orlp:unsafe-mean-chore (356a522) with main (4e17d02)}

Summary

⚡ 1 improvements
✅ 21 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	orlp:unsafe-mean-chore	Change
⚡	test_windows_not_cached	3.5 s	3.2 s	+10.24%