Fix validation of negative floats when using multiple_of

[Viicos]

Change Summary

Fixes pydantic/pydantic#8154

Related issue number

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

[codecov]

Codecov Report

Merging #1077 (920324a) into main (2f0c8c2) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1077   +/-   ##
=======================================
  Coverage   89.63%   89.63%           
=======================================
  Files         106      106           
  Lines       16397    16397           
  Branches       35       35           
=======================================
  Hits        14698    14698           
  Misses       1692     1692           
  Partials        7        7           

Files	Coverage Δ
src/validators/float.rs	90.44% <100.00%> (ø)

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[codspeed-hq]

CodSpeed Performance Report

Merging #1077 will not alter performance

_{Comparing Viicos:8154-multiple-of (920324a) with main (2f0c8c2)}

Summary

✅ 140 untouched benchmarks

[davidhewitt]

Thanks; will rebase to fix the lint issue and merge!