[submodule] Update submodule sonic-swss to the latest HEAD automatically (sonic-net#20485)

#### Why I did it
src/sonic-swss
```
* 55fd3f18 - (HEAD -> master, origin/master, origin/HEAD) [dash]: Wait for routing type config when adding VNET mapping (sonic-net#3312) (5 hours ago) [Lawrence Lee]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld