Add quotes around pyrhon version 3.10

otherwise parsed as 3.1

.github/workflows/on_pull_request.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.10
+          python-version: '3.10'
 
       - name: Install Python dependencies
         run: pip install .[dev]