deps: update ruff requirement from >=0.11.0 to >=0.15.13 (#53)

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@0.11.0...0.15.13)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.13
  dependency-type: direct:development
...

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Author: dependabot[bot]

requirements-dev.txt

@@ -1,5 +1,5 @@
 pytest>=9.0.3
 pytest-asyncio>=1.3.0
 pytest-cov>=5.0
-ruff>=0.11.0
+ruff>=0.15.13
 tzdata>=2026.2