[submodule] Update submodule sonic-swss to the latest HEAD automatically (#20831)

#### Why I did it
src/sonic-swss
```
* fcd9d9eb - (HEAD -> 202405, origin/202405) [Dynamic Buffer][Mellanox] Enhance port shared headroom pool check (#3272) (4 hours ago) [Stephen Sun]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld