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 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[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