CI: upgrade python version

.github/workflows/tests.yml

@@ -24,36 +24,25 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        #python-version: [2.7, 3.6]
-        python-version: [2.7]
-        requirements-level: [min, pypi]
+        python-version: [3.9]
+        requirements-level: [pypi]
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-
-      - name: Generate dependencies
-        run: |
-          python -m pip install --upgrade "pip>=20,<21" "setuptools>=40,<46" py
-          python -m pip install wheel coveralls requirements-builder configparser
-          requirements-builder --level=${{ matrix.requirements-level }} setup.py > .${{ matrix.requirements-level }}-${{ matrix.python-version }}-requirements.txt
-
-      - name: Cache pip
-        uses: actions/cache@v2
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('.${{ matrix.requirements-level }}-${{ matrix.python-version }}-requirements.txt') }}
+          cache: pip
 
       - name: Install dependencies
         run: |
-          pip install -r .${{matrix.requirements-level}}-${{ matrix.python-version }}-requirements.txt
-          pip install -e .[all]
+          pip install .
           pip freeze
+          docker --version
+          docker-compose --version
 
       - name: Run tests
         run: ./run-tests.sh