build(deps-dev): update ruff requirement from ^0.5.0 to ^0.6.1

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@0.5.0...0.6.1)

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

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

pyproject.toml

@@ -22,7 +22,7 @@ coverage = "^7.5.3"
 
 [tool.poetry.dev-dependencies]
 pytest = "^8.2.2"
-ruff = "^0.5.0"
+ruff = "^0.6.1"
 
 [tool.poetry.scripts]
 slotBooker = "slotbooker.main:main"