Fix check_python_versions script

Author: Denis-Averin

.github/workflows/python-latest.yml

@@ -52,7 +52,7 @@ jobs:
         python -m pip install -r requirements.txt -r test-requirements.txt
     - name: Lint
       run: |
-        python -m check_python_versions --expect 3.6- --only setup.py
+        python -m check_python_versions --expect 3.9- --only setup.py
     - name: Test
       env:
         TEST_CONFIGURATION_ACCESS_TOKEN: ${{ secrets.TEST_CONFIGURATION_ACCESS_TOKEN }}