[sonic-utilities] Update submodule (#8168)

Update:
> 2ca493b 2021-07-13 create sniffer folder if not exist (sonic-net/sonic-utilities#1659) 
> 1695104 2021-07-07 [show priority-group drop counters] Remove backup with cached PG drop counters after 'config reload' (sonic-net/sonic-utilities#1679) 
> e99a3c5 2021-07-07 [show][config] support for interface alias for muxcable commands (sonic-net/sonic-utilities#1699)