chore(deps): update actions/checkout action to v6 (#3596)

Author: argoproj-renovate[bot]

.github/workflows/renovate.yaml

@@ -23,7 +23,7 @@ jobs:
           private-key: ${{ secrets.RENOVATE_APP_PRIVATE_KEY }}
 
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with:
           persist-credentials: false