chore(deps): bump ruff from 0.15.5 to 0.15.6

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.5 to 0.15.6.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.5...0.15.6)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements-tests.txt

@@ -4,6 +4,6 @@ mypy==1.19.1
 pytest==9.0.2
 pytest-dependency==0.6.1
 responses==0.26.0
-ruff==0.15.5
+ruff==0.15.6
 ruff-api==0.2.1
 types-requests==2.32.4.20260107