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

…utomatically (#20043)

#### Why I did it
src/sonic-host-services
```
* 4fb94d1 - (HEAD -> 202311, origin/202311) Fix modify_single_file generate empty file issue (#145) (9 minutes ago) [Hua Liu]
```
#### How I did it
#### How to verify it
#### Description for the changelog