Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/swiftfiddle-runner-functions-531-AutoDeployTrigger-e940c2fa-803f-478c-97f6-a8d33132e9f1.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout to the branch
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Azure Login
         uses: azure/login@v1