Add poetry cache to Python setup

.github/workflows/tests.yml

@@ -18,18 +18,16 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+    - name: Install poetry
+      run: pipx install poetry
     - name: Set up Python 3.10
       uses: actions/setup-python@v3
       with:
         python-version: "3.10"
+        cache: poetry
     - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install poetry
-        poetry install --with dev
+      run: poetry install --with dev
     - name: Run tests
       run: poetry run pytest --mpl --cov=api.calculator --cov-report=xml
-    - name: Lint
-      run: poetry run ruff check
     - name: Upload coverage reports to Codecov with GitHub Action
       uses: codecov/codecov-action@v3