ci: test with latest py312

Author: hauntsaninja

.github/workflows/tests.yml

@@ -30,7 +30,7 @@ jobs:
           - {python: '3.9', tox: py39}
           - {python: '3.10', tox: py310}
           - {python: '3.11', tox: py311}
-          - {python: '3.12-dev', tox: py312}
+          - {python: '3.12', tox: py312}
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5