update python setup, reorder poetry steps to match docs

.github/workflows/ci.yml

@@ -156,20 +156,20 @@ jobs:
         - name: Checkout repository
           uses: actions/checkout@v2    
         - name: Set up Python
-          uses: actions/setup-python@v2
+          uses: actions/setup-python@v4
           with: 
             python-version: 3.11.x
-        - name: Poetry cache
-          uses: actions/cache@v3
-          with:
-            path: ~/.cache/pypoetry
-            key: poetry-cache-${{ runner.os }}-${{ steps.setup_python.outputs.python-version }}-${{ env.POETRY_VERSION }}
         - name: Install Poetry
           uses: snok/install-poetry@v1
           with:
             virtualenvs-create: true
             virtualenvs-in-project: true
             installer-parallel: true
+        - name: Load cached venv
+          uses: actions/cache@v3
+          with:
+            path: .venv
+            key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
         - name: Install dependencies
           run: |
             make full;