Use latest checkout action

Author: jverce

.github/workflows/pipedream-sdk-markdown-lint.yaml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Lint markdown files
         uses: DavidAnson/markdownlint-cli2-action@v17

.github/workflows/pipedream-sdk-test.yaml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3