[5.0.x] Applied Black's 2024 stable style.

https://github.com/psf/black/releases/tag/24.1.0

Backport of 305757aec1 from main

tests/basic/models.py

@@ -3,6 +3,7 @@ Bare-bones model
 
 This is a basic model with only two non-primary-key fields.
 """
+
 import uuid
 
 from django.db import models