[submodule] Update submodule sonic-linux-kernel to the latest HEAD automatically (#24991)

#### Why I did it
src/sonic-linux-kernel
```
* 6d3b6ac - (HEAD -> 202511, origin/202511) Update to 6.12.41 for Debian Trixie (#526) (5 days ago) [mssonicbld]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld