Back to py3.11 for now

Author: pgleeson

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.12" ] 
+        python-version: [ "3.11" ] 
         engine:
           - Arbor
           - "Brian2:2.9.0"