Replace python-appdirs with python-platformdirs
Related upstream commit https://github.com/hgrecco/pint/commit/0b0ae61cebe6c470dcc2edbb84fe717c664fc223.
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Related upstream commit https://github.com/hgrecco/pint/commit/0b0ae61cebe6c470dcc2edbb84fe717c664fc223.