Replace distutils.LooseVersion with packaging.version #901
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In Python 3.12, distutils does no longer exist. In spectral-cube it is used only for version comparison. This PR replaces it with packaging.version.parse resp. packaging.version.Version. On places where LooseVersion is unused, the import is just removed.
This should make the package compatible to Python 3.12; at least the tests that we run during the Debian build pass.