Upgrade to tox v4

Author: kytta

tox.ini

@@ -1,12 +1,16 @@
 [tox]
-envlist =
+requires =
+    tox>=4.2
+env_list =
     py3{11, 10, 9, 8}-dj42
     py3{11, 10, 9, 8}-dj41
     py3{10, 9, 8}-dj32
     py3{12, 11, 10}-djmain
 isolated_build = true
 
 [testenv]
+package = wheel
+wheel_build_env = .pkg
 deps =
     covdefaults
     coverage[toml]
@@ -17,7 +21,7 @@ deps =
 pass_env =
     FORCE_COLOR
     NO_COLOR
-setenv =
+set_env =
     DJANGO_SETTINGS_MODULE = simple_menu.test_settings
 commands =
     coverage run -m django test -v2 {posargs:simple_menu}