ci(test): install poetry before caching

.github/workflows/test.yml

@@ -18,18 +18,22 @@ jobs:
   test:
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9, 3.10, 3.11]
+        python: ["3.7", "3.8", "3.9", "3.10", "3.11"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Install poetry
+        run: |
+          curl -O -sSL https://install.python-poetry.org/install-poetry.py
+          python install-poetry.py -y --version 1.1.12
+          echo "PATH=${HOME}/.poetry/bin:${PATH}" >> $GITHUB_ENV
+          rm install-poetry.py
       - uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python }}
           cache: poetry
       - name: Setup Graphviz
         uses: ts-graphviz/setup-graphviz@v1
-      - name: Install poetry
-        run: pip install poetry
       - name: Run all tests
         run: |
           poetry install