Update sonic-utilities

```
23e9398 [scripts/fast-reboot] Shutdown remaining containers through systemd (sonic-net#2133)
576c9ef [scripts/fast-reboot] stop timers in advance (sonic-net#2131)
4dad79c bugfix: incorrect command for portchannel creation (sonic-net#2134)
c17b1f4 [show][muxcable] Decrease the timeout for show mux status/hwmode (sonic-net#2130)
49d61f8 [scripts/fast-reboot] cleanup (sonic-net#2132)
52ca324 [config/config_mgmt.py]: Fix dpb issue with upper case mac in (sonic-net#2066)
9e2fbf4 Update db_migrator to support `pfcwd_sw_enable` (sonic-net#2087)
4010bd0 FGNHG CLI changes (sonic-net#1588)
6bd54d0 Fix 'show mac' output when FDB entry for default vlan is None instead of 1 (sonic-net#2126)
```

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

Author: stepanblyschak