Update tox.ini

tox.ini

@@ -12,7 +12,7 @@ deps =
     -r{toxinidir}/tests/requirements/base.txt
     dj32: Django>=3.2,<3.3
     dj42: Django>=4.2,<4.3
-    dj50: Django>=5.0,<4.1
+    dj50: Django>=5.0,<5.1
     dj51: Django>=5.1,<5.2
     djmain: https://github.com/django/django/archive/main.tar.gz
 commands =