⬆️ Bump actions/checkout from 4 to 6 (#1091)

Author: dependabot[bot]

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

@@ -25,7 +25,7 @@ jobs:
     # If you do not check out your code, Copilot will do this for you.
     steps:
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v5