[202012] Submodule update for sonic-utilities (#11400)

Signed-off-by: Neetha John <[email protected]>

This PR contains the following commits
5a54bd7 Added cisco config platform commands (sonic-net/sonic-utilities#2241)
62c1640 [config/load_mgmt_config] Support load IPv6 mgmt IP (sonic-net/sonic-utilities#2206)
c061a18 Fix header for the output table following 'show ipv6 interface' command (sonic-net/sonic-utilities#2219)
ecca18ff [202012] Update load minigraph to load backend acl (sonic-net/sonic-utilities#2235)