CI: test Python 3.13, promote Python 3.12 to non-exp

Signed-off-by: Sam James <sam@gentoo.org>
Closes: #126
Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

Author: thesamesam

.github/workflows/test.yml

@@ -13,11 +13,11 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ['3.10', '3.11']
+        python-version: ['3.10', '3.11', '3.12']
         experimental: [false]
         include:
           - os: ubuntu-latest
-            python-version: '3.12-dev'
+            python-version: '3.13-dev'
             experimental: true
           - os: macos-latest
             python-version: '3.11'