Bump ruff from 0.5.5 to 0.6.8 in the pip group across 1 directory

Bumps the pip group with 1 update in the / directory: [ruff](https://github.com/astral-sh/ruff).


Updates `ruff` from 0.5.5 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@0.5.5...0.6.8)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: pip
...

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

pyproject.toml

@@ -50,7 +50,7 @@ test = [
     "jupyterlab",
 ]
 # Check ruff version is aligned with the one in .pre-commit-config.yaml
-dev = ["build", "mypy", "pre-commit", "hatch", "ruff==0.5.5"]
+dev = ["build", "mypy", "pre-commit", "hatch", "ruff==0.6.8"]
 
 [project.scripts]
 jupyter-builder = "jupyter_builder.main:main"