[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/serializers/models/base.py

@@ -4,6 +4,7 @@ Serialization
 ``django.core.serializers`` provides interfaces to converting Django
 ``QuerySet`` objects to and from "flat" data (i.e. strings).
 """
+
 from decimal import Decimal
 
 from django.db import models

tests/serializers/models/data.py

@@ -4,6 +4,7 @@ The following classes are for testing basic data marshalling, including
 NULL values, where allowed.
 The basic idea is to have a model for each Django data type.
 """
+
 import uuid
 
 from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation

tests/serializers/models/natural.py

@@ -1,4 +1,5 @@
 """Models for test_natural.py"""
+
 import uuid
 
 from django.db import models

tests/serializers/test_data.py

@@ -6,6 +6,7 @@ test case that is capable of testing the capabilities of
 the serializers. This includes all valid data values, plus
 forward, backwards and self references.
 """
+
 import datetime
 import decimal
 import uuid