trying to install python manually, running setup-python on debian does not seem to work

.gitea/workflows/python-pep8.yaml

@@ -9,13 +9,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - uses: https://github.com/actions/setup-python@v4
-        with:
-          python-version: '3.9.16'
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
+          apt-get install -y python3-pip
           pip install flake8
 
       - name: Run checking