gh-76785: Fix Windows Refleak in test_interpreters#117913

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ericsnowcurrently merged 2 commits intopython:mainfrom

ericsnowcurrently:fix-windows-refleak

Apr 16, 2024

Commits on Apr 15, 2024

Drop unused code.
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Commits on Apr 16, 2024

Avoid importing test.support.os_helper in legacy interpreters.
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