chore: add support for Django 5.2

tox.ini

@@ -6,6 +6,7 @@ envlist =
     py{39,310,311,312}-django42
     py{310,311,312}-django50
     py{310,311,312,313}-django51
+    py{310,311,312,313}-django52
     lint
     coverage
 
@@ -30,6 +31,7 @@ deps =
     django42: django>=4.2,<4.3
     django50: django>=5.0,<5.1
     django51: django>=5.1,<5.2
+    django52: django>=5.2,<5.3
 
 [testenv:lint]
 basepython = python3.12