chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/dependency-automerge.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       # ✅ Step 1: Checkout the repo (Fixes "not a git repository" issue)
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       # ✅ Step 2: Authenticate GitHub CLI (Ensure gh CLI works)
       - name: Authenticate GitHub CLI