[submodule]: Advance sonic-utilities. (#4324)

798ce2f [multi-asic]: Update reload of systemd services to support multi-asic platforms (#856)
6f51428 [Mellanox] Fix thermal control issue: use natural sort for fan status and thermal status (#836)
51d26ce [ntp]: support "show ntp" with mgmt vrf based on linux os version (#858)

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>