Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
     timeout-minutes: 25
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Setup SSH Agent
         uses: webfactory/ssh-agent@v0.9.0
         with: