Update github actions versions

Author: pgleeson

.github/workflows/omv-ci.yml

@@ -17,10 +17,10 @@ jobs:
         engine: [ jNeuroML, jNeuroML_NEURON, jNeuroML_PyNN_NEURON, jNeuroML_validate, PyNN_NEURON, PyNN_Nest, PyNN_NeuroML, PyNN_Brian2]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python  ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
       with:
         python-version:  ${{ matrix.python-version }}