[submodule] Update submodule sonic-sairedis to the latest HEAD automatically (sonic-net#24589)

#### Why I did it
src/sonic-sairedis
```
* 868b208f - (HEAD -> master, origin/master, origin/HEAD) Increase the number of hugepages for DPU (sonic-net#1696) (2 days ago) [Connor Roos]
* 39feee1e - update sai version to 17.1 (sonic-net#1685) (3 days ago) [lakshmi-nexthop]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Signed-off-by: gordon-nexthop <[email protected]>

Author: mssonicbld