[submodule] Update submodule sonic-linux-kernel to the latest HEAD automatically (sonic-net#704)

#### Why I did it
src/sonic-linux-kernel
```
* 6877ae3 - (HEAD -> 202412, origin/HEAD, origin/202412) [optoe] Reset page select byte to 0 before upper memory access on page 0h (sonic-net#464) (#18) (21 hours ago) [mssonicbld]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld