[sonic-utilities] Submodule update (sonic-net#7921)

Update sonic-utilities submodule. This include the following commits:

285960d [config]: Update environment file during config reload (sonic-net#1673)
3f0ecd5 [config] Remove "reset failed" print lines from config reload (sonic-net#1654) 
a1c8751 Make the soft-reboot available in the SONiC image on master (sonic-net#1681)
45e7b71 [Mellanox] Add all results from saisdkdump to the techsupport on Mellanox switches (sonic-net#1660)