Remove duplicate checkout step in workflow

Removed duplicate checkout step in workflow.

.github/workflows/copilot-setup-steps.yml

@@ -20,13 +20,13 @@ jobs:
       OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
 
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
       - name: Persist Secrets to Agent Environment
         run: |
           echo "OPENAI_API_KEY=${{ secrets.OPENAI_API_KEY }}" >> .env.llm-tests
 
-      - name: Checkout code
-        uses: actions/checkout@v6
-
       - name: Install system dependencies
         run: |
           sudo apt-get update