Bump black from 25.1.0 to 25.12.0 in /requirements

Bumps [black](https://github.com/psf/black) from 25.1.0 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@25.1.0...25.12.0)

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

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

Author: dependabot[bot]

requirements/local.txt

@@ -39,7 +39,7 @@ billiard==4.2.1
     # via
     #   -r base.txt
     #   celery
-black==25.1.0
+black==25.12.0
     # via -r local.in
 build==1.3.0
     # via
@@ -364,6 +364,8 @@ python-stdnum==2.1
     # via
     #   -r base.txt
     #   django-localflavor
+pytokens==0.4.1
+    # via black
 pytz==2025.2
     # via -r base.txt
 pyyaml==6.0.2