Updating submodule pointers for sonic-utilities (#5921)

sonic-utilities:
[3f15835] [sflow] Add mVRF support (#1230)
[dadfc18] Copp Changes (#1004)
[b226159] [CLI][PFCWD] Fix issue with specifying ports in pfcwd start on masic platforms (#1203)
[40377d3] [chassis]: Configure and show for platform chassis_modules (#1145)
[d5eb2f8] [consutil][connect] Remove root need from connect line command (#1225)
[6cbec6b] [multi-ASIC] CRM show/config commands changes for multi-asic (#1127)

Co-authored-by: dgsudharsan <sudharsan_gopalarat@dell.com>