Update tox.ini

Automatically created by the almighty Aleksolotl.

tox.ini

 [tox]
 skipsdist = True
 skip_missing_interpreters = true
-envlist = py39,py310,py311
+envlist = py310,py311,py312
 
 [testenv]
 allowlist_externals =
@@ -42,6 +42,8 @@ commands =
 commands_pre =
     poetry install
     poetry run sh -c "cd aleksis; aleksis-admin compilemessages"
+    poetry run aleksis-admin yarn install
+    poetry run aleksis-admin compile_scss
 commands = poetry build
 
 [testenv:docs]