[sonic-utilities] update submodule

```
c05845d Add trap flow counter support (sonic-net#1868)
ef82f00 [load_minigraph] Delay pfcwd start until the buffer templates are rendered (sonic-net#1937)
f5e5a56 [sonic-package-manager] support sonic-cli-gen and packages with YANG model (sonic-net#1650)
64777a4 generic_config_updater: Filename changed & VLAN validator added (sonic-net#1919)
1f8f6ab [config reload] Update command reference (sonic-net#1941)
```

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