TEST: update actions setup-python to v4 and checkout to v3, add caching to python (#1428)

* update actions setup-python to v4 and checkout to v3, add caching to python

* fix ordering of steps for poetry to be cached

* poetry setup ordering

* order in formatting.yml

.github/workflows/mypy.yml

@@ -10,18 +10,18 @@ jobs:
         python-version: ["3.9"]
         poetry-version: ["1.3.1"]
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ matrix.python-version }}
+      - uses: actions/checkout@v3
       - name: Set up Poetry ${{ matrix.poetry-version }}
         uses: abatilo/actions-poetry@v2
         with:
           poetry-version: ${{ matrix.poetry-version }}
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'poetry'
       - name: Install dependencies
         run: |
-          poetry config virtualenvs.create false
           poetry install
       - name: Run tests
         run: poetry run mypy