Bump art from 5.9 to 6.1

Bumps [art](https://github.com/sepandhaghighi/art) from 5.9 to 6.1.
- [Release notes](https://github.com/sepandhaghighi/art/releases)
- [Changelog](https://github.com/sepandhaghighi/art/blob/master/CHANGELOG.md)
- [Commits](sepandhaghighi/art@v5.9...v6.1)

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

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

dev-requirements.txt

@@ -1,4 +1,4 @@
-art==5.9
+art==6.1
 pytest>=4.3.1
 pytest-cov>=2.6.1
 setuptools>=40.8.0