chore: Change CI python version to 3.12

Author: mikkokotila

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       max-parallel: 9
       matrix:
-        python-version: [3.7, 3.8]
+        python-version: [3.12]
         os: [ubuntu-latest, macos-latest]
 
     steps: