ci: use client-id for the pre-commit autoupdate app token (#14)

The app-id input of actions/create-github-app-token is deprecated in
favour of client-id. Switch to client-id, sourced from the org variable
LF_AUTOMATION_CLIENT_ID.

Author: markuslf

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

@@ -15,7 +15,7 @@ jobs:
         id: 'app-token'
         uses: 'actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1' # v3.2.0
         with:
-          app-id: '${{ vars.LF_AUTOMATION_APP_ID }}'
+          client-id: '${{ vars.LF_AUTOMATION_CLIENT_ID }}'
           private-key: '${{ secrets.LF_AUTOMATION_APP_PRIVATE_KEY }}'
 
       - name: 'Checkout repository'