Fix miri float precision test

[Ogeon]

Reduces the precision requirement to pass tests with floating point randomization.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.90%. Comparing base (e1d6dfc) to head (c353711).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #467   +/-   ##
=======================================
  Coverage   81.90%   81.90%           
=======================================
  Files         122      122           
  Lines       17034    17034           
  Branches    17034    17034           
=======================================
  Hits        13952    13952           
  Misses       2984     2984           
  Partials       98       98           

Components	Coverage Δ
palette	81.92% <ø> (ø)
palette_derive	∅ <ø> (∅)
palette_math	∅ <ø> (∅)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 47 untouched benchmarks

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_{Comparing fix_miri_tests (c353711) with master (e1d6dfc)}