fix: improve test case inputs in selector table fuzz

[charles-cooper]

What I did

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Commit message

this commit improves the fuzz examples for the selector table. the
nested `@given` tests too many "dumb" examples (ex. 0, 1, max_value)
when `max_examples` is not large enough. the nested `@given` strategy
can find falsifying inputs, but it requires the inner `max_examples` to
be set much higher, and the shrinking takes much longer. this setting
of `max_examples=125` with a single `@given` using the `@composite`
strategy in this commit finds the selector table bug (that was fixed in
823675a8dc) after an average of 3 runs.

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[codecov-commenter]

Codecov Report

Merging #3625 (f8e1cff) into master (1e9922d) will increase coverage by 0.03%.
Report is 5 commits behind head on master.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3625      +/-   ##
==========================================
+ Coverage   89.01%   89.04%   +0.03%     
==========================================
  Files          86       86              
  Lines       11455    11460       +5     
  Branches     2607     2606       -1     
==========================================
+ Hits        10197    10205       +8     
+ Misses        836      832       -4     
- Partials      422      423       +1     

see 6 files with indirect coverage changes

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