[issue12504] packaging: fix uninstall and stop skipping its tests

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 2b9a0a091566 by Éric Araujo in branch 'default':
Close file handles in a timely manner in packaging.database (#12504).
http://hg.python.org/cpython/rev/2b9a0a091566

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nosy: +python-dev

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