Bump ruff from 0.5.5 to 0.5.6

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.5.5 to 0.5.6.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.5.5...0.5.6)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements_testing.txt

@@ -4,7 +4,7 @@ pylint==3.2.6
 pytest==8.3.2
 pytest-cov==5.0.0
 pytest-icdiff==0.9
-ruff==0.5.5
+ruff==0.5.6
 setuptools==72.1.0
 tox==4.16.0
 tox-gh-actions==3.2.0