Update sonic-utilities submodule

4236bc4 [config reload] Fixing config reload when timer based delayed services are disabled (#1967)
d2514e4 [GCU] Different apply-patch runs should produce same sorted steps (#1988)
2878adb [GCU] Using simulated config instead of target config when validating replace operation in NoDependencyMoveValidator (#1987)
fb8ca98 [GCU] Loading yang-models only once (#1981)
f88ee92 [GCU] Copying config_db before callding sonic_yang.loadData (#1983)
9ed0e91 [GCU] Implementing DryRun by printing patch-sorter steps/imitating config_db (#1973)
b36b5e3 [GCU] Moving PatchSorter unit-test to json file to make it easier to read/maintain (#1977)
c0fa28b [generic-config-updater] Improving CreateOnly validator and marking /LOOPBACK_INTERFACE/LOOPBACK#/vrf_name as create-only (#1969)
0559d04 [generic-config-updater] Adding non-strict mode (#1929)
b07f477 [debug dump util] FDB debug dump util changes (#1968)
6d8757a [warm/fast-reboot] Fix kexec portion to support platforms based on Device Tree (#1966)
cc1409e [Auto Techsupport] Event driven Techsupport Bug Fixes (#1986)
6c48bd5 Fix wrong help message for cable length setting (#1978)
c0bbbe3 [breakout] Fix the check  when port is not present in BREAKOUT_CFG table (#1765)
5bb8cad [doc][DPB] Update DPB related interface breakout command Info (#1438)
e6fd990 [config] Fix 'config reload -l' command to get filename by default (#1611)
bd8f7bb Update swss_ready check to check per namespace swss service (#1974)
5439f94 [soft-reboot] Add support for platforms based on Device Tree (#1963)
7c5810a [config] Add portchannel support  for static route  (#1857)
7cb6a1b preserve old order for config reload (#1964)
20bddbd [Auto-Techsupport] Issues related to Multiple Cores crashing handled (#1948)