update github actions

.github/workflows/test.yml

@@ -16,13 +16,11 @@ jobs:
       - name: Start MySQL
         run: sudo systemctl start mysql.service
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - name: Install poetry
+        uses: abatilo/actions-poetry@v1.5.0
         with:
-          python-version: '3.x'
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements-dev.txt
+          python_version: 3.8.0
+          args: install
       - name: CI
         env:
           MYSQL_PASS: root