Replace Black with Ruff Format

.pre-commit-config.yaml

@@ -1,9 +1,4 @@
 repos:
-- repo: https://github.com/psf/black
-  rev: 23.12.1
-  hooks:
-  - id: black
-    language_version: python3
 - repo: https://github.com/pre-commit/mirrors-mypy
   rev: v1.8.0
   hooks:
@@ -18,3 +13,4 @@ repos:
   hooks:
     - id: ruff
       args: [--fix]
+    - id: ruff-format

CONTRIBUTING.md

@@ -80,7 +80,7 @@ If you haven't used poetry before, just run `pip install poetry`, and then run t
 4. Do the changes in your fork.
 5. If you like the change and think the project could use it:
     * Be sure you have the pre-commit hook installed above, it will ensure that
-    [Black](https://github.com/ambv/black) is automatically run on any changes for
+    [Ruff](https://docs.astral.sh/ruff/) is automatically run on any changes for
     consistent code formatting.
     * [Sign](https://help.github.com/articles/signing-commits/) your commits.
     * Note the Generic Code of Conduct.

README.md

@@ -4,7 +4,6 @@
 [![Maintainability](https://api.codeclimate.com/v1/badges/c7be2d28400687b1375a/maintainability)](https://codeclimate.com/github/gaphor/generic/maintainability)
 [![Test Coverage](https://api.codeclimate.com/v1/badges/c7be2d28400687b1375a/test_coverage)](https://codeclimate.com/github/gaphor/generic/test_coverage)
 [![Documentation Status](https://readthedocs.org/projects/generic/badge/?version=latest)](https://generic.readthedocs.io/en/latest/?badge=latest)
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
 [![Matrix](https://img.shields.io/badge/chat-on%20Matrix-success)](https://app.element.io/#/room/#gaphor_Lobby:gitter.im)
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/gaphor/generic/badge)](https://securityscorecards.dev/viewer/?platform=github.com&org=gaphor&repo=generic)