Bump black from 23.7 to 23.12.1 in /server

Bumps [black](https://github.com/psf/black) from 23.7 to 23.12.1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.7.0...23.12.1)

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

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

server/requirements.txt

@@ -40,7 +40,7 @@ uvicorn[standard]==0.26.0
 
 # dev
 daphne==4.0.*
-black==23.7
+black==23.12.1
 isort==5.13.2
 flake8==7.0.0
 pytest==7.4.4