Set python version for linting

.github/workflows/python-linting.yml

@@ -8,6 +8,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
+        with:
+          python-version: '3.10' 
       - name: (Python) Use black to do linting
         run: |
           pip install black