[submodule] Update submodule sonic-linux-kernel to the latest HEAD au…

…tomatically (#21358)

#### Why I did it
src/sonic-linux-kernel
```
* 7e8ca67 - (HEAD -> 202405, origin/202405) [PCI/ASPM] Revert commit `456d8aa` to avoid kernel panics in `6.1.94` (#448) (#453) (17 hours ago) [kenneth-arista]
```
#### How I did it
#### How to verify it
#### Description for the changelog