build(deps-dev): update ruff requirement from >=0.15.18 to >=0.15.20

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@0.15.18...0.15.20)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.20
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -32,7 +32,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest>=9.1.0",
-    "ruff>=0.15.18",
+    "ruff>=0.15.20",
     "mypy>=2.1.0",
     "types-PyYAML>=6.0.12"
 ]