Update and fix iocStats

[mdavidsaver]

Update the bundled iocStats. Also, fix source dist builds by including os/posix/* headers.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.16%. Comparing base (98a7630) to head (00de22a).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #199   +/-   ##
=======================================
  Coverage   88.16%   88.16%           
=======================================
  Files          15       15           
  Lines        1259     1259           
=======================================
  Hits         1110     1110           
  Misses        149      149           

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[mdavidsaver]

The build/windows-latest/cp39 job is failing due to numpy/numpy#27224, which is not fixed in the version of numpy being pulled in.

[AlexanderWells-diamond]

Thank you Michael, I agree with these changes. The CI failures are indeed unrelated to this change.

I'm working on the CI fixes in PR #198