Update lint.yml

Author: maarten-boot

.github/workflows/lint.yml

@@ -7,10 +7,10 @@ jobs:
     steps:
       - name: Check out repository
         uses: actions/checkout@v3
-      - name: Set up Python 3.9
+      - name: Set up Python 3.6
         uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: 3.6
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip