Bump ruff from 0.15.14 to 0.15.18

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.14 to 0.15.18.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.14...0.15.18)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.17
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

dev_requirements.txt

@@ -15,7 +15,7 @@ python-docx==1.2.0
 python-pptx==1.0.2
 
 # Quality tooling — used by .github/workflows/quality.yml and locally.
-ruff==0.15.14
+ruff==0.15.18
 bandit==1.9.4
 pytest==9.0.3
 pytest-timeout==2.4.0