fix aio test failures on darwin

[gdamore]

Actually this test appears to be broken everywhere, and the only reason it ever worked is that we took > 50 ms to context switch.

fixes #

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.21%. Comparing base (2592bfc) to head (1a4d71c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1884      +/-   ##
==========================================
- Coverage   77.23%   77.21%   -0.02%     
==========================================
  Files          95       95              
  Lines       22286    22286              
==========================================
- Hits        17213    17209       -4     
- Misses       5073     5077       +4     

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