Update checkout action to not persist credentials

Set persist-credentials to false for checkout action

Signed-off-by: Kalle Westerling <7298727+kallewesterling@users.noreply.github.com>

Author: kallewesterling

.github/workflows/sync-prod-gcs.yaml

@@ -29,6 +29,8 @@ jobs:
 
       - name: Checkout code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Authenticate to Google Cloud
         id: auth