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Fix flaky pytest-run-parallel CI crash#251
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While triggering a full CI run to test a v2.1 release, I happened to trigger a CI crash:
https://github.com/ngoldbaum/cffi-ft/actions/runs/28403191570/job/84159323543
I tracked it down to this test, which upon inspection is clearly not thread-safe. It mutates the process global libc stdout pointer. The correct fix is to mark it as thread-unsafe.