chore(deps): update actions/checkout action to v6

Author: blahspambot

.github/workflows/renovate.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Run renovate
         uses: renovatebot/[email protected]