fix(CI): Move cache action before poetry install

.github/workflows/python-app.yml

@@ -20,16 +20,6 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: 3.9
-    - name: Python Poetry Action
-      # You may pin to the exact commit or the version.
-      # uses: abatilo/actions-poetry@8284d202bc272a8d0597e26e1c0b4a0d0c73db93
-      uses: abatilo/actions-poetry@v2.1.0
-      with:
-        # The version of poetry to install
-        poetry-version: 1.1.7
-    - name: Install dependencies
-      run: |
-        poetry install
     - name: Cache
       uses: actions/cache@v2.1.6
       with:
@@ -40,6 +30,16 @@ jobs:
         restore-keys: |
           venv-cache-${{hashFiles('**/poetry.lock')}}
           venv-cache-
+    - name: Python Poetry Action
+      # You may pin to the exact commit or the version.
+      # uses: abatilo/actions-poetry@8284d202bc272a8d0597e26e1c0b4a0d0c73db93
+      uses: abatilo/actions-poetry@v2.1.0
+      with:
+        # The version of poetry to install
+        poetry-version: 1.1.7
+    - name: Install dependencies
+      run: |
+        poetry install
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names