[submodule] Update submodule sonic-platform-daemons to the latest HEA…

…D automatically (#18976)

#### Why I did it
src/sonic-platform-daemons
```
* 88bf8ec - (HEAD -> master, origin/master, origin/HEAD) [chassis][midplane] Modify the chassisd to log expected/unexpected midplane connectivity messages (#480) (34 hours ago) [Marty Y. Lok]
```
#### How I did it
#### How to verify it
#### Description for the changelog