Switch to faster black-pre-commit-mirror

Ref: https://github.com/psf/black/blob/23.12.1/.pre-commit-hooks.yaml

Author: martinclaus

.pre-commit-config.yaml

@@ -18,7 +18,7 @@ repos:
           - --py38-plus
 
   # Autoformat: Python code
-  - repo: https://github.com/psf/black
+  - repo: https://github.com/psf/black-pre-commit-mirror
     rev: 23.12.1
     hooks:
       - id: black