test 3.11 and 3.12

Author: pgleeson

.github/workflows/omv-ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.9", "3.11" ]
+        python-version: [ "3.11", "3.12" ]
         engine:
            - "PyNEURON:7.8.2"
            - "PyNEURON:8.0.0"