Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
       - name: Install Node
         uses: volta-cli/action@v4
         with: