[202012] - sonic-swss submodule update (#10391)

* [202012] - sonic-swss submodule update to include following commits:

fca407a (HEAD) [VNET]Fixing nexthop group delete during route change (#2198)
a9b6b47 [vxlan] Remove tunnel map objects on VNET tunnel removal (#2208)
74e9b9f [FdbOrch] SAI_FDB_EVENT_MOVE generates update with empty update.entry.port_name (#2201)
0a99445 [202012][BFD]Registering BFD state change callback during session creation (#2203)
aebe4a1 [VS test] skip dpb flaky test (#2195) (#2207)