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

…lly (#20852)

#### Why I did it
src/sonic-swss
```
* 1918744c - (HEAD -> 202405, origin/202405) VOQ: Set the ECMP group size to 128. (#3351) (61 minutes ago) [Deepak Singhal]
```
#### How I did it
#### How to verify it
#### Description for the changelog