[submodule] Update submodule sonic-swss to the latest HEAD automatica…

…lly (sonic-net#19374)

#### Why I did it
src/sonic-swss
```
* 78af15dd - (HEAD -> master, origin/master, origin/HEAD) Use unix socket for redis connection (sonic-net#3190) (2 days ago) [Junchao-Mellanox]
* 4b4aaf91 - [vlanmgr] use IP command for vlan_filtering and no_linklocal_learn, remove echo command (sonic-net#3198) (2 days ago) [Mai Bui]
```
#### How I did it
#### How to verify it
#### Description for the changelog