chore(deps-dev): bump ruff from 0.12.7 to 0.12.8

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.12.7 to 0.12.8.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](https://github.com/astral-sh/ruff/compare/0.12.7...0.12.8)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.12.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

requirements-dev.txt

@@ -6,7 +6,7 @@
 -r requirements-freqai-rl.txt
 -r docs/requirements-docs.txt
 
-ruff==0.12.7
+ruff==0.12.8
 mypy==1.17.1
 pre-commit==4.2.0
 pytest==8.4.1