Add tox environments

This neatens up and brings up to date the various combinations of Python, Django and Postgres/Psycopg

Author: jasondilworth56

tox.ini

@@ -3,29 +3,40 @@
 # Taken from:
 # https://docs.djangoproject.com/en/dev/faq/install/#what-python-version-can-i-use-with-django
 envlist =
-    py{38,39,310}-django{32,40,41}-{sqlite,postgres},
-    py{38,39,310,311}-django{41}-{sqlite,postgres},
+    py{38,39,310}-django{32,40,41}-{sqlite,postgres-psycopg2},
+    py{38,39,310,311,312}-django{41,42}-{sqlite,postgres-psycopg2},
+    py{310,311,312}-django{50,51,52}-{sqlite,postgres-psycopg3}
 
 [gh-actions]
 python =
     3.8: py38
     3.9: py39
     3.10: py310
     3.11: py311
+    3.12: py312
 
 [testenv]
 commands =
     py.test
 passenv = DB
 deps =
   pytest
-  psycopg2-binary>=2.8
+  psycopg2: psycopg2-binary>=2.8
+  psycopg3: psycopg[binary]>=3.1
   django32: Django>=3.2,<3.3
   django32: pytest-django>=4.2
   django40: Django>=4.0,<4.1
   django40: pytest-django>=4.5
   django41: Django>=4.1,<4.2
   django41: pytest-django>=4.5
+  django42: Django>=4.2,<4.3
+  django42: pytest-django>=4.5
+  django50: Django>=5.0,<5.1
+  django50: pytest-django>=4.5
+  django51: Django>=5.1,<5.2
+  django51: pytest-django>=4.5
+  django52: Django>=5.2,<5.3
+  django52: pytest-django>=4.5
 setenv =
   sqlite: DB=sqlite
   postgres: DB=postgres