[202012][submodule] Advance sonic-utilities pointer

Update sonic-utilities submodule pointer to include the following:
* 94a3436 [show] vnet endpoint [ip/ipv6] command (sonic-net#2342) ([sonic-net#2421](sonic-net/sonic-utilities#2421))
* 84a0712 [VxLAN]Fix Vxlan delete command to throw error when there are references ([sonic-net#2404](sonic-net/sonic-utilities#2404))
* 1341f58 [202012] [generate_dump]: Enhance show techsupport for cisco-8000 platform ([sonic-net#2395](sonic-net/sonic-utilities#2395))

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