[submodule] Update submodule sonic-sairedis to the latest HEAD automatically (#24246)

#### Why I did it
src/sonic-sairedis
```
* 8123a982 - (HEAD -> master, origin/master, origin/HEAD) Increase ZMQ buffer size to accomodate large bulk calls (#1660) (11 hours ago) [Vivek]
* 6b16b1ee - Fix create_loopback_instance occasional failure (#1600) (22 hours ago) [yue-fred-gao]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld