Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/swiftfiddle-runner-functions-552-AutoDeployTrigger-565be0b3-201c-42ea-95df-ae61c2ece95b.yml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout to the branch
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Azure Login
         uses: azure/login@v1