[Submodule] update for swss (#8839)

*[Submodule] update for swss with following commits:
a3fdaf4 QOS fieldvalue reference ABNF format to string changes ([sonic-platform-daemons] Update submodule #1754)
a8fcadf Add sleep to ensure starting route perf test after the vs is stable ([mellanox]: Update hw-mgmt service with the stop action #1929)
a89d1f8 Fix failing DPB LAG tests ([socat]: build socat with readline #1919)
86b4ede [portsorch] Avoid orchagent crash when set invalid interface types to port (Upgrade azure-keyvault to known compatible version #1906)
025032f [VS] Skip failing test - test_recirc_port ([rsyslog]: use # to separate container and program name in syslog msg #1918)
d338bd0 [pfcwd] Fix the polling interval time granularity (Download newer version (8.23.0-2) of rsyslog from jessie-backports in hopes of eliminating memory leaks #1912)
14c937e Enabling copp tests ([Mellanox] Update hw-management service config #1914)
fbdcaae [teammgrd]: Improve LAGs cleanup on shutdown: send SIGTERM directly to PID. ([docker-syncd-mlnx] add new mlnx-sfpd daemon to docker-syncd-mlnx #1841)
002bb1d [tlm teamd] Add retry mechanism before logging the ERR in get_dumps. ([py-swss/config] config load-minigraph failure leaves database in wrong state #1629)
57d21e7 [pfcwd] Convert polling interval from ms to us in LUA scripts ([interfaces]: Move IP/MTU information from interfaces file into database #1908)
d01524d [fgnhgorch] Enable packet flow when no FG ECMP neighbors are resolved (Update arista driver submodule to includes interrupt handling changes #1900)
8cf355d Mux state order change ([submodule] update snmpagent and dbsyncd, extending/implementing ieee802.1ab, rfc3433, rfc2737 MIBs #1902)