[202012][submodule] Advance sonic-utilities pointer (#12359)

Update sonic-utilities submodule pointer to include the following:

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

Signed-off-by: dprital <[email protected]>