chore(deps): update dependency python-slugify to v5

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
python-slugify	==4.0.1 -> ==5.0.2

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Release Notes

un33k/python-slugify

v5.0.2

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• Enable twine publish

v5.0.1

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• Drop support for python 2.7, 3.5 & tox, clean up

v5.0.0

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• Add support for Py 3.9 - added tox (@​jon-betts - Thx)
• Drop support for python 2.7, 3.5 & friends

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