[submodule] Update submodule sonic-sairedis to the latest HEAD automa…

…tically (#18934)

#### Why I did it
src/sonic-sairedis
```
* 256ce7d - (HEAD -> master, origin/master, origin/HEAD) [syncd]: Generate syncd_dash (#1377) (27 hours ago) [Ze Gan]
```
#### How I did it
#### How to verify it
#### Description for the changelog