[sonic-utilities] Update submodule (sonic-net#5129)

* src/sonic-utilities 9700e45...621aad0 (9):
  > [Python] Migrate applications/scripts to import sonic-py-common package (sonic-net#1008)
  > [config qos] QoS and Buffer config genration for multi ASIC platforms (sonic-net#978)
  > [cli]: pass db connector as click context (sonic-net#1029)
  > [PDDF] Make utilities compatible to platform API 2.0, in accordance with pddf_2.0 (sonic-net#940)
  > [tests] Add unit tests for 'show platform ...' commands (sonic-net#1021)
  > Add secure fast/warm-reboot support for Aboot (sonic-net#994)
  > [sonic-installer] Create Envvars File for Incoming Image (sonic-net#1011)
  > [config load]: do not stop/reset/reload service if it is disabled (sonic-net#1028)
  > [tests]: move feature_test.py into tests folder (sonic-net#1027)