[202012][sonic-utilities] update submodule

```
08495be [scripts/fast-reboot] Shutdown remaining containers through systemd (sonic-net#2133)
fa07373 [scripts/fast-reboot] stop timers in advance (sonic-net#2131)
00ef80e [show][muxcable] Decrease the timeout for show mux status/hwmode (sonic-net#2130)
```

Signed-off-by: Stepan Blyschak <stepanb@nvidia.com>