[issue11659] Fix ResourceWarning in test_subprocess

[Nadeem Vawda]

Nadeem Vawda <nadeem.vawda at gmail.com> added the comment:

Looks good to me.

> [...] but I couldn't find any patches that fix this specific issue.

Well, test_select_unbuffered() was only introduced a few days ago (changeset
cb148da52c47), so I'm not surprised :)

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nosy: +nvawda

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