Django 5.2 tests (#623)

Author: Mogost

tox.ini

@@ -15,7 +15,7 @@ deps =
     dj42: django>=4.2,<4.3
     dj50: django>=5.0,<5.1
     dj51: django>=5.1,<5.2
-    dj52: django==5.2alpha1
+    dj52: django>=5.2,<5.3
     djmain: https://github.com/django/django/archive/main.tar.gz
     pytest: pytest
     pytest: pytest-cov