Bump ruff from 0.15.11 to 0.15.12

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.11 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
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 colorlog==6.10.1
 homeassistant==2025.12.0
 pip>=21.3.1
-ruff==0.15.11
+ruff==0.15.12
 pre-commit
 
 # Install HA and test dependencies (pytest, coverage)