[submodule] Update submodule sonic-platform-daemons to the latest HEAD automatically (sonic-net#15918)

#### Why I did it
src/sonic-platform-daemons
```
* 76baca3 - (HEAD -> master, origin/master, origin/HEAD) Fixes for the issues uncovered by sonic-pcied unit tests (sonic-net#389) (32 hours ago) [Ashwin Srinivasan]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld