tox.ini: Enable testing on Django v5.0

tox.ini

@@ -9,6 +9,7 @@ envlist =
     py{38,39,310,311,py38,py39}-django32-mongo-alchemy-{sqlite,postgres}
     py{38,39,310,311,py38,py39}-django40-mongo-alchemy-{sqlite,postgres}
     py{38,39,310,311,py38,py39}-django41-mongo-alchemy-{sqlite,postgres}
+    py{310,311,3.12}-django50-mongo-alchemy-{sqlite,postgres}
     py310-djangomain-mongo-alchemy-{sqlite,postgres}
 
 [gh-actions]
@@ -39,9 +40,9 @@ deps =
     django32: Django>=3.2,<3.3
     django41: Django>=4.1,<4.2
     django42: Django>=4.2,<5.0
-    django50: Django>=5.0b1,<5.1
+    django50: Django>=5.0,<5.1
     djangomain: https://github.com/django/django/archive/main.tar.gz
-    py{38,39,310,311}-postgres: psycopg2-binary
+    py{38,39,310,311,312}-postgres: psycopg2-binary
     pypy{38,39}-postgres: psycopg2cffi
 
 setenv =