PendingDeprecationWarning: Using compatability mode with libmagic's python binding

spotted on CI:

=============================== warnings summary ===============================
.pybuild/cpython3_3.9/build/tests/test_diff_mask.py::test_none
.pybuild/cpython3_3.9/build/tests/test_diff_mask.py::test_none

  /usr/lib/python3/dist-packages/magic/__init__.py:455: PendingDeprecationWarning: Using compatability mode with libmagic's python binding. See https://github.com/ahupp/python-magic/blob/master/COMPAT.md for details.

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