Merge pull request #53 from beeware/autoupdates/pre-commit/black

Bump black from 23.11.0 to 23.12.0

Author: freakboy3742

.pre-commit-config.yaml

@@ -19,8 +19,8 @@ repos:
     hooks:
       - id: pyupgrade
         args: [--py38-plus]
-  - repo: https://github.com/psf/black
-    rev: 23.11.0
+  - repo: https://github.com/psf/black-pre-commit-mirror
+    rev: 23.12.0
     hooks:
     - id: black
   - repo: https://github.com/PyCQA/flake8