[submodule] Update submodule sonic-linux-kernel to the latest HEAD automatically (#24559)

#### Why I did it
src/sonic-linux-kernel
```
* 255dc52 - (HEAD -> master, origin/master, origin/HEAD) Automated agent pool migration (#515) (35 hours ago) [yijingyan2]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld