use actions checkout

.github/workflows/django.yml

@@ -14,6 +14,7 @@ jobs:
     #     python-version: [3.7, 3.8, 3.9]
 
     steps:
+      - uses: actions/checkout@v4
       - name: 'Hello world'
         run: echo "Hello world!"
       - name: Dime la fecha