Bump ruff from 0.6.7 to 0.6.8 (#5312)

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:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_tests.txt

@@ -6,7 +6,7 @@ pytest-asyncio==0.23.6
 pytest-cov==5.0.0
 pytest-timeout==2.3.1
 pytest==8.3.3
-ruff==0.6.7
+ruff==0.6.8
 time-machine==2.15.0
 typing_extensions==4.12.2
 urllib3==2.2.3