fix: remove zizmor.yml and fix all workflow security issues

Agent-Logs-Url: https://github.com/nextcloud/all-in-one/sessions/19702b0d-13f7-43fb-bc62-d2cdca2232b5

Co-authored-by: szaimen <42591237+szaimen@users.noreply.github.com>

.github/workflows/nextcloud-update.yml

@@ -6,6 +6,10 @@ on:
   schedule:
   - cron:  '00 12 * * *'
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   run_update_sh:
     name: Run nextcloud-update script