chore(deps-dev): bump black from 25.9.0 to 25.12.0 in /requirements

Bumps [black](https://github.com/psf/black) from 25.9.0 to 25.12.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@25.9.0...25.12.0)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 25.12.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/dev.txt

@@ -46,6 +46,6 @@ filelock==3.20.1;  python_version>="3.10"
 filelock==3.19.1;  python_version<"3.10"
 
 # formatter
-black==25.9.0; python_version>="3.9"
+black==25.12.0; python_version>="3.9"
 black==24.8.0; python_version<"3.9"
 psutil==7.2.0