Pin Python version to 3.11

.github/workflows/python-tests.yml

@@ -58,7 +58,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.x'
+          python-version: '3.11'
           architecture: x64
       - name: Install dependencies
         run: |