[sonic-swss] update submodule

```
323dc34 [neighsyncd] increase neighsyncd timeout (sonic-net#2209)
7f99941 Remove redundant and problematic code to skip "pool" field in buffer profile handling (sonic-net#2197)
f3a0feb [Vxlanmgr] vnet netdev cleanup during config reload fix (sonic-net#2191)
13ccaba Fix issue: sometimes PFC WD unable to create zero buffer pool (sonic-net#2185)
```

Signed-off-by: Stepan Blyschak <stepanb@nvidia.com>