Bump ruff from 0.8.3 to 0.8.6

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.8.3 to 0.8.6.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.8.3...0.8.6)

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

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

requirements-dev.txt

@@ -1,4 +1,4 @@
 coverage[toml]==7.6.9
-ruff==0.8.3
+ruff==0.8.6
 sphinx==8.1.3
 webtest==3.0.2