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

…lly (#17142)

#### Why I did it
src/sonic-swss
```
* 644b227a - (HEAD -> master, origin/master, origin/HEAD) [portsorch]: Implement port PFC asym capability check (#2942) (3 days ago) [Nazarii Hnydyn]
```
#### How I did it
#### How to verify it
#### Description for the changelog