tox.ini: Testing Django v6.0

These tests are ___currently failing___, so let's work to make them ✅

Author: cclauss

tox.ini

@@ -4,7 +4,7 @@ envlist =
     py{310,311,312}-dj50
     py{310,311,312}-dj51
     py{310,311,312,313,314}-dj52
-    # py{312,313,314}-djmain
+    py{312,313,314}-djmain
 
 skipsdist = True