Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/run-api-integration.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Check out the repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Node.js
         uses: actions/setup-node@v5