deps(deps): update ruff requirement in the batch-updates group (#20)

Updates the requirements on [ruff](https://github.com/astral-sh/ruff) to permit the latest version.

Updates `ruff` to 0.15.12
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.11...0.15.12)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.12
  dependency-type: direct:production
  dependency-group: batch-updates
...

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Author: dependabot[bot]

requirements-test.txt

@@ -1,6 +1,6 @@
 -r requirements.txt
 black>=26.3.1
-ruff>=0.15.11
+ruff>=0.15.12
 pytest>=9.0.3
 pytest-cov>=7.1.0
 mock>=5.2.0