Restore non-persistence of credentials

I think Copilot misled me.

Co-authored-by: Copilot <[email protected]>

Author: colindean

.github/workflows/pre-commit-updates.yml

@@ -48,7 +48,7 @@ jobs:
     steps:
       - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
         with:
-          persist-credentials: true
+          persist-credentials: false
 
       - name: Download changed .pre-commit-config.yaml
         uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0