[submodule] Advance sonic-utilities pointer

Update sonic-utilities submodule pointer to include the following:
* 4a3d49d Fix exception in adding mirror_session when gre_type is absent ([sonic-net#2458](sonic-net/sonic-utilities#2458))
* 7e7d05c Update the DBmigrator to support persistent loglevel during warm-upgrade ([sonic-net#2370](sonic-net/sonic-utilities#2370))
* c2841b8 [doc]: Update Command-Reference.md ([sonic-net#2444](sonic-net/sonic-utilities#2444))
* 254cafc Event Counters CLI ([sonic-net#2449](sonic-net/sonic-utilities#2449))
* 2dab0d0 [techsupport] Adding FRR EVPN dumps ([sonic-net#2442](sonic-net/sonic-utilities#2442))
* 3c0aece [show][muxcable] add support for show mux firmware version all ([sonic-net#2441](sonic-net/sonic-utilities#2441))

Signed-off-by: dprital <drorp@nvidia.com>