Bump ruff from 0.6.7 to 0.6.8

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.6.7 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@0.6.7...0.6.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

Pipfile

@@ -14,4 +14,4 @@ mypy = "==1.11.2"
 black = {version = "==24.8.0", markers="python_version >= '3.8'"}
 tbump = "==6.11.0"
 sphinx = {version = "==8.0.2", markers="python_version >= '3.10'"}
-ruff = "==0.6.7"
+ruff = "==0.6.8"