Update ruff requirement from ~=0.8 to ~=0.9

Updates the requirements on [ruff](https://github.com/astral-sh/ruff) to permit the latest version.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.8.0...0.9.1)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements_dev.txt

@@ -4,7 +4,7 @@ mypy
 pydantic
 pre-commit>=3.6.1
 python-dotenv>=1.0.1
-ruff~=0.8
+ruff~=0.9
 mkdocs-material==9.5.47
 mkdocstrings[python]==0.27.0