Update ruff requirement from ~=0.4 to ~=0.6

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@v0.4.0...0.6.2)

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

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

requirements_dev.txt

@@ -3,4 +3,4 @@ types-paho-mqtt
 mypy>=1.8.0
 pre-commit>=3.6.1
 python-dotenv>=1.0.1
-ruff~=0.4
+ruff~=0.6