Bump ruff from 0.5.7 to 0.6.8

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.5.7 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@0.5.7...0.6.8)

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

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

requirements.txt

@@ -1,4 +1,4 @@
 colorlog==6.8.2
 homeassistant==2024.3.2
 pip>=21.0,<24.3
-ruff==0.5.7
+ruff==0.6.8