use setup cache option instead of action

deployments/azure-webapps-python.yml

@@ -40,19 +40,12 @@ jobs:
         uses: actions/setup-python@v2.2.2
         with:
           python-version: ${{ env.PYTHON_VERSION }}
+          cache: 'pip'
 
       - name: Create and start virtual environment
         run: |
           python -m venv venv
           source venv/bin/activate
-      
-      - name: Set up dependency caching for faster installs
-        uses: actions/cache@v2
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
 
       - name: Install dependencies
         run: pip install -r requirements.txt