Update python-magic to 0.4.24

[pyup-bot]

This PR updates python-magic from 0.4.18 to 0.4.24.

Changelog

0.4.24

- Fix regression in library loading on some Alpine docker images.

0.4.23

- Include a `py.typed` sentinal to enable type checking
- Improve fix for attribute error during destruction
- Cleanup library loading logic
- Add new homebrew library dir for OSX

0.4.22

- Unify dll loader between the standard and compat library, fixing load
failures on some previously supported platforms.

0.4.20

- merge in a compatibility layer for the upstream libmagic python binding.
Since both this package and that one are called 'magic', this compat layer
removes a very common source of runtime errors.  Use of that libmagic API will
produce a deprecation warning.

- support python 3.9 in tests and pypi metadata

- add support for magic_descriptor functions, which take a file descriptor
rather than a filename.

- sometimes the returned description includes snippets of the file, e.g a title
for MS Word docs.  Since this is in an unknown encoding, we would throw a
unicode decode error trying to decode.  Now, it decodes with
'backslashreplace' to handle this more gracefully.  The undecodable characters
are replaced with hex escapes.

- add support for MAGIC_EXTENSION, to return possible file extensions.

- add mypy typing stubs file, for type checking

Links

• PyPI: https://pypi.org/project/python-magic
• Changelog: https://pyup.io/changelogs/python-magic/
• Repo: http://github.com/ahupp/python-magic