Update syncthing to version 1.21.0 / rev 126 via SR 1001383
    
    https://build.opensuse.org/request/show/1001383
    by user mkittler + dimstar_suse
    - Update to 1.21.0
      * Bugfixes:
        #8219: REST API: db/completion no output when one folder is paused
        #8479: Panic in failure reporting
      * Enhancements:
        #1329: Add support for syncing ownership of files
        #7981: Show likely status of disconnected devices
        #8296: Auto-accepted receive-encrypted folders should have more sensible defaults
        #8323: Show internally used paths in the GUI for debugging
        #8448: Remove "restart on wakeup" functionality