Avoid spurious failure in nearest_to fuzzer

[finnbear]

Fixes a rare issue with the nearest_to fuzzer.

 thread '<unnamed>' panicked at fuzz_targets/fuzz.rs:356:13:
assert_abs_diff_eq!(best.1, flat_best.1)

    left  = 0.0003059545
    right = 0.00030377653

https://github.com/svenstaro/bvh/actions/runs/12971033150/job/36176984562?pr=149

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 49.24%. Comparing base (e0b53e7) to head (29ab709).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
fuzz/fuzz_targets/fuzz.rs	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
- Coverage   49.31%   49.24%   -0.07%     
==========================================
  Files          17       17              
  Lines        1462     1462              
==========================================
- Hits          721      720       -1     
- Misses        741      742       +1     

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