⬆ Bump ruff from 0.6.2 to 0.6.8

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.6.2 to 0.6.8.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.6.2...0.6.8)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements-tests.txt

@@ -2,7 +2,7 @@
 pytest >=7.0.1,<9.0.0
 coverage[toml] >=6.2,<8.0
 mypy ==1.4.1
-ruff ==0.6.2
+ruff ==0.6.8
 typing-extensions ==4.6.1
 
 pytest-cov ==4.1.0