Test on Django 5.2

tox.ini

@@ -2,14 +2,14 @@
 isolated_build = True
 envlist =
     {3.12,3.13}-djmain
-    {3.10,3.11,3.12,3.13,pypy310}-dj{5.0,5.1}
+    {3.10,3.11,3.12,3.13,pypy310}-dj{5.0,5.1,5.2}
     {3.9,3.10,3.11,3.12,3.13,pypy39,pypy310}-dj4.2
     {3.9,3.10,3.11,3.12,3.13,pypy39,pypy310}-types
 
 
 # Don't run coverage when testing with pypy:
 # see https://github.com/nedbat/coveragepy/issues/1382
-[testenv:pypy{39,310}-dj4.2,pypy310-dj{5.0,5.1}]
+[testenv:pypy{39,310}-dj4.2,pypy310-dj{5.0,5.1,5.2}]
 commands =
     pytest {toxinidir}/csp
 
@@ -40,6 +40,7 @@ deps =
     dj4.2: Django>=4.2,<4.3
     dj5.0: Django>=5.0.1,<5.1
     dj5.1: Django>=5.1,<5.2
+    dj5.2: Django>=5.2a1,<5.3
     djmain: https://github.com/django/django/archive/main.tar.gz