[sonic-utilities] update submodule

```
4818360 [sonic-package-manager] support warm/fast reboot for extension packages (sonic-net#1554)
793b847 [show priority-group drop counters] Remove backup with cached PG drop counters after 'config reload' (sonic-net#1679)
24fe1ac [show][config] support for interface alias for muxcable commands (sonic-net#1699)
```

Signed-off-by: Stepan Blyschak <[email protected]>