[submodule] Update submodule sonic-linux-kernel to the latest HEAD automatically (#16931)

#### Why I did it
src/sonic-linux-kernel
```
* 6508505 - (HEAD -> master, origin/master, origin/HEAD) Add drop monitor Kernel Patches for buffer support (#338) (3 hours ago) [Vivek]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2023-10-18 18:33:58 +08:00 committed by GitHub
parent c90bffebbd
commit dd0d4a7689
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@ -1 +1 @@
Subproject commit fee7d7ec859fd6efe610a02399d251f765b7c823 Subproject commit 6508505bea84ed786fa72ff9d7bbb195932c66d9