[202012][submodule] Update sonic-swss and sonic-utilites submodules for 202012 (#7105)

sonic-swss
* [nbrmgrd] added function to parse IP address from APP_DB (#1672)
* [MUX/PFCWD] Use in_ports for acls instead of seperate ACL table (#1670)
* [mux] VS test for neigh, route and fdb (#1656)
* [Dynamic buffer calc] Bug fix: Remove PGs from an administratively down port. (#1652)
* spell check fixes (#1630)

sonic-utilities
* [reboot]: Stop mux before reboot on dual ToR (#1500)
* [config] Disable/enable container monitoring when stopping/starting services (#1499)
* Add 'show' and 'clear' command for PG drop (#1461)
* [CLI][techsupport] Add NOOP option for commands that did not have that option (#1445)
* [202012][reload] Improve reload by using sonic.target (#1509)

Signed-off-by: Danny Allen <[email protected]>

Author: daall