Update ruff requirement from ~=0.8.6 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@0.8.6...0.9.1)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -4,4 +4,4 @@ pylint~=3.2.7
 pylint-secure-coding-standard~=1.5.1
 mypy~=1.14.1
 types-pexpect
-ruff~=0.8.6
+ruff~=0.9.1