Bump ruff from 0.15.4 to 0.15.8

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.4 to 0.15.8.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.4...0.15.8)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,4 +2,4 @@
 numpy==2.2.3
 pytest==8.4.2
 pytest-cov==7.1.0
-ruff==0.15.4
+ruff==0.15.9