chore(deps-dev): bump ruff from 0.15.15 to 0.15.16 in /tests

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.15 to 0.15.16.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.15...0.15.16)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.16
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tests/pyproject.toml

@@ -9,7 +9,7 @@ dependencies = [
   "cryptography>=48.0.0",
   "pytest>=9.0.3",
   "python-dotenv>=1.2.2",
-  "ruff>=0.15.15",
+  "ruff>=0.15.16",
   "scratchattach",
 ]