add 3.12

Author: dlawin

.github/workflows/ci.yml

@@ -22,6 +22,7 @@ jobs:
           - "3.9"
           - "3.10"
           - "3.11"
+          - "3.12"
 
     name: Check Python ${{ matrix.python-version }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}