tox: Add tox-gh-actions config for Python 3.12

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

.github/workflows/ci.yaml

@@ -27,6 +27,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
+        # NOTE: If you add a version here, don't forget to update the
+        # '[gh-actions]' section in tox.ini
         python: ["3.8", "3.9", "3.10", "3.11", "3.12"]
         db: [postgres, mysql, sqlite3]
     env:

tox.ini

@@ -75,3 +75,4 @@ python =
     3.9: py39
     3.10: py310
     3.11: py311
+    3.12: py312