[202012][sonic-swss] Updated submodule for sonic-swss (#9790)

includes:

320591a [DualToR] Handle race condition between tunnel_decap and mux orchestrator (#2114)
5027a8f Handling Invalid CRM configuration gracefully (#2109)
0b120fa [ci]: use native arm64 and armhf pool (#2013)
394e88a Don't handle buffer pool watermark during warm reboot reconciling (#1987)
9008a01 patch for issue #1971 - enable Rx Drop handling for cisco-8000 (#2041)
2723ee3 create debug_shell_enable config to enable debug shell (#2060)
d7be0b9 [request parser] Add unit tests for request parser for multiple values (#1766)