[202012][sonic-platform-daemons][sonic-utilities] update submodule (#14048)

For sonic-platform-daemons following commits are added to the submodule

dd8fbae (HEAD -> 202012, origin/202012) [ycabled] add more coverage to ycabled; add minor name change for vendor API CLI return key-values pairs (#338)
846555e [thermalctld] fix some redundant removal of state DB tables (#315)
3d92fb9 Use github code scanning instead of LGTM (#316)

For sonic-utilities the following commits are added in this PR to the submodule
git log --oneline 39cdb49c..202012
ec4c6ea5 (HEAD -> 202012, origin/202012) [show][muxcable] add some new commands health, reset-cause, queue_info support for muxcable (#2414) (#2704)
03ef272e [202012][vlan] Remove add field of vlanid to DHCP_RELAY table while adding vlan (#2681)
e00a81ac [202012][dhcp-relay] Add support for dhcp_relay config cli (#2640)
274184e1 [vlan] Refresh dhcpv6_relay config while adding/deleting a vlan (#2660) (#2668

#### Why I did it
updating the submodule of sonic-platform-daemons, sonic-utilities

#### How I did it

updated the submodule

Author: vdahiya12