ci: disable credential persistence in repo config

Author: bsoyka

.github/workflows/repo-config.yml

@@ -18,6 +18,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
+          persist-credentials: false
           sparse-checkout: .github/labels.yml
 
       - uses: EndBug/label-sync@52074158190acb45f3077f9099fea818aa43f97a # v2.3.3