[202012][submodule] update sonic-utilities (#12124)

47dc7ea Added support for tunnel route status in show vnet routes all. (#2341)
7b8a62f Vnet_route_check Vxlan tunnel route update. (#2281) (#2376)
b21e2ce [202012][sonic_installer] consider existing swap when setting up swap

Signed-off-by: Xichen Lin <[email protected]>

Author: Xichen96