fix: bump black from 25.11.0 to 25.12.0 in /app (#52)

Bumps [black](https://github.com/psf/black) from 25.11.0 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@25.11.0...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

app/requirements.txt

@@ -4,5 +4,5 @@ Requests==2.32.5
 selenium==4.39.0
 termcolor==3.2.0
 Werkzeug==3.1.4
-black==25.11.0
+black==25.12.0
 ruff==0.14.7