[submodule] Update submodule sonic-swss to the latest HEAD automatically (#21611)

#### Why I did it
src/sonic-swss
```
* 29f2f48d - (HEAD -> 202311, origin/202311) [ci]Use sonictest instead of sonic-common for test stage. (#3485) (7 hours ago) [Liu Shilong]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld