Update CI workflow to use Ubuntu 22.04 and Python 3.11

Author: pgleeson

.github/workflows/omv-ci.yml

@@ -10,11 +10,11 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04  # for eden...
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.10" ]
+        python-version: [ "3.10", "3.11" ]
         engine: [ jNeuroML, jNeuroML_NEURON, jNeuroML_validate, jNeuroML_Moose, "jNeuroML_Moose:4.0.0.dev20240411", jNeuroML_EDEN ]
 
     steps: