Add python 3.12 to test workflow

Author: smokestacklightnin

.github/workflows/ci-test.yml

@@ -18,7 +18,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v4