Add support of python 3.13 and django 5.1

Author: jcapiitao

.github/workflows/test.yml

@@ -12,9 +12,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:  # https://docs.djangoproject.com/en/5.0/faq/install/#faq-python-version-support
-        django-version: [50]
+        django-version: [50, 51]
         python-version: [3.10, 3.11, 3.12]
 
+        exclude:
+          - django-version: 50
+            python-version: 3.13
+
     steps:
       - uses: actions/checkout@v4
       - name: setup python

tox.ini

@@ -1,8 +1,9 @@
 [tox]
-envlist = django50
+envlist = django{50,51}
 
 [testenv]
 commands =
     python runtests.py
 deps =
     django50: Django>=5.0,<5.1
+    django51: Django>=5.1,<5.2