Fix minor ruff errors

Author: stephane

src/testproj/testproj/testapp/jinja2/env.py

@@ -1,11 +1,8 @@
-from jinja2.environment import Environment
-
 from django.template.defaultfilters import yesno
 from django.templatetags.static import static
-from webstack_django_sorting.jinja2_globals import (
-    sorting_anchor,
-    sort_queryset,
-)
+from jinja2.environment import Environment
+
+from webstack_django_sorting.jinja2_globals import sort_queryset, sorting_anchor
 
 
 class JinjaEnvironment(Environment):

src/testproj/testproj/testapp/migrations/0001_initial.py

@@ -1,5 +1,5 @@
-from django.db import migrations, models
 import django.utils.timezone
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):

src/testproj/testproj/testapp/models.py

@@ -10,4 +10,4 @@ class SecretFile(models.Model):
     is_secret = models.BooleanField(default=False)
 
     def __str__(self):
-        return "#%d %s" % (self.order, self.filename)
+        return f"#{self.order} {self.filename}"