[1.8.x] Sorted imports with isort; refs #23860.

Backport of 0ed7d15563 from master

tests/admin_docs/views.py

@@ -1,7 +1,7 @@
+from django.contrib.admindocs.middleware import XViewMiddleware
 from django.http import HttpResponse
 from django.utils.decorators import decorator_from_middleware
 from django.views.generic import View
-from django.contrib.admindocs.middleware import XViewMiddleware
 
 xview_dec = decorator_from_middleware(XViewMiddleware)