[sonic-utilities] Update submodule (#5129)

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