Bump ruff from 0.15.5 to 0.15.6 in /python

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

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

Author: dependabot[bot]

python/pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
 dev = [
     "uv==0.10.9",
     "flit==3.12.0",
-    "ruff==0.15.5",
+    "ruff==0.15.6",
     "pytest==9.0.2",
     "pytest-asyncio==1.3.0",
     "pytest-cov==7.0.0",