Update to use official instead of release candidate django 5.0

tox.ini

@@ -32,7 +32,7 @@ deps =
     dj32: django>=3.2,<3.3
     dj41: django>=4.1,<4.2
     dj42: django>=4.2,<4.3
-    dj50: django>=5.0rc1
+    dj50: django>=5.0,<5.1
     djmain: https://github.com/django/django/archive/main.tar.gz
     py312: setuptools
 setenv =