tox: Remove basepython
This follows a similar change in Kayobe [1]. [1] https://review.opendev.org/c/openstack/kayobe/+/947726 Change-Id: I661694cf9a49fd471fc83e0b5b1c0eedc3ab7767
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This follows a similar change in Kayobe [1]. [1] https://review.opendev.org/c/openstack/kayobe/+/947726 Change-Id: I661694cf9a49fd471fc83e0b5b1c0eedc3ab7767