chore(deps): update actions/checkout action to v2

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
           --workdir /home/dynamodblocal
           --health-cmd "curl --fail http://127.0.0.1:8000/shell/ || exit 1" --health-interval 10s --health-timeout 5s --health-retries 5
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: Prepare
         run: npm ci
       - name: Lint