Update ruff requirement from ~=0.8.1 to ~=0.9.1

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@0.8.1...0.9.1)

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

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

pyproject.toml

@@ -45,7 +45,7 @@ tests = [
     "pandas-stubs~=2.0",
     "pytest~=8.0",
     "pytest-cov~=6.0",
-    "ruff~=0.8.1",
+    "ruff~=0.9.1",
 ]
 
 [project.urls]