Update default python to latest supported (ansible#182)

Author: cidrblock

.github/workflows/tox.yml

@@ -30,7 +30,7 @@ jobs:
         with:
           min_python: "3.10"
           max_python: "3.12"
-          default_python: "3.11" # used by jobs in other_names
+          default_python: "3.12" # used by jobs in other_names
           other_names: |
             lint
             docs