make fuzz checks more lenient

[samuelcolvin]

Fix fuzz failures on #130 and #132.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.91%. Comparing base (eccf28e) to head (796152a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
- Coverage   94.92%   94.91%   -0.01%     
==========================================
  Files          12       12              
  Lines        1910     1908       -2     
==========================================
- Hits         1813     1811       -2     
  Misses         97       97              

see 1 file with indirect coverage changes

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[codspeed-hq]

CodSpeed Performance Report

Merging #133 will improve performances by 13.72%

_{Comparing fix-fuzz-failutres (796152a) with main (eccf28e)}

Summary

⚡ 4 improvements
✅ 69 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	fix-fuzz-failutres	Change
⚡	sentence_serde_value	8.9 µs	7.9 µs	+13.61%
⚡	true_array_jiter_skip	5.1 µs	4.5 µs	+13.72%
⚡	python_parse_string_array_not_cached	40.2 µs	36.2 µs	+11.15%
⚡	python_parse_true_array	16.6 µs	14.6 µs	+13.42%