Fix lint workflow: use Python 3.9 and pinned black from [test] extras

black==20.8b1 (pinned in setup.py) is incompatible with click>=8.1 on
Python 3.11+. Use Python 3.9 for linting (matching original workflow)
and rely on the pinned versions from [test] extras instead of installing
black/flake8/isort separately with --upgrade.

Author: yanjunqiAz

.github/workflows/check-formatting.yml

@@ -15,13 +15,12 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: "3.11"
+        python-version: "3.9"
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip setuptools wheel
         python setup.py install_egg_info
         pip install -e .[test]
-        pip install black flake8 isort --upgrade
     - name: Check code format with black and isort
       run: |
         make lint