[submodule] Update submodule sonic-host-services to the latest HEAD a…

…utomatically (#19732)

#### Why I did it
src/sonic-host-services
```
* 81a4ee8 - (HEAD -> 202405, origin/202405) Fix security vulnerability in caclmgrd (#139) (4 days ago) [Zhaohui Sun]
```
#### How I did it
#### How to verify it
#### Description for the changelog