Update omv-ci.yml

Author: pgleeson

.github/workflows/omv-ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.9",  "3.10" ] # Brian no longer supported on py3.8
+        python-version: [ "3.9",  "3.10", "3.12" ] # Brian no longer supported on py3.8
         engine: [ jNeuroML, jNeuroML_NEURON, jNeuroML_PyNN_NEURON, jNeuroML_validate, PyNN_NEURON, PyNN_Nest, PyNN_NeuroML, PyNN_Brian2]
 
     steps: