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

…tomatically (sonic-net#18290)

#### Why I did it
src/sonic-linux-kernel
```
* 45295bf - (HEAD -> master, origin/master, origin/HEAD) Fix the issue with signed kernel compilation for ARM64 architecture (sonic-net#381) (54 minutes ago) [Oleksandr Ivantsiv]
```
#### How I did it
#### How to verify it
#### Description for the changelog