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ARROW-15890: [CI][Python] Use venv instead of virtualenv

Closes #12592 from pitrou/python-venv

Lead-authored-by: Antoine Pitrou <antoine@python.org>
Co-authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>