[submodule] Update submodule sonic-swss to the latest HEAD automatically (#24471)

#### Why I did it
src/sonic-swss
```
* 838f47f5 - (HEAD -> 202505, origin/202505) [orchagent] Add FEC frame loss ratio monitoring with predictive analytics (#3953) (2 days ago) [Apoorv Sachan]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld