Update Python version and GitHub actions versions

Author: pgleeson

.github/workflows/omv-ci.yml

@@ -16,14 +16,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.10", "3.11" ]
+        python-version: [ "3.13" ]
         engine: [ jNeuroML_validate ]
 
     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 }}