[submodule] Update submodule sonic-platform-daemons to the latest HEAD automatically (sonic-net#19668)

#### Why I did it
src/sonic-platform-daemons
```
* d6a4635 - (HEAD -> master, origin/master, origin/HEAD) [xcvrd] Fix xcvrd crash for RJ45 cable type (sonic-net#513) (9 hours ago) [Vivek]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld