Bump python-slugify from 5.0.2 to 6.1.1

Bumps [python-slugify](https://github.com/un33k/python-slugify) from 5.0.2 to 6.1.1.
- [Release notes](https://github.com/un33k/python-slugify/releases)
- [Changelog](https://github.com/un33k/python-slugify/blob/master/CHANGELOG.md)
- [Commits](https://github.com/un33k/python-slugify/compare/5.0.2...v6.1.1)

---
updated-dependencies:
- dependency-name: python-slugify
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,3 +1,3 @@
 amcrest==1.9.3
 paho-mqtt==1.6.1
-python-slugify==5.0.2
+python-slugify==6.1.1