[submodule] Update submodule sonic-platform-daemons to the latest HEAD automatically (#21662)

#### Why I did it
src/sonic-platform-daemons
```
* a2c4bc9 - (HEAD -> master, origin/master, origin/HEAD) Added fix for issue:21371 update cp and dp states when midplane goes down (#584) (20 hours ago) [rameshraghupathy]
* 585541f - reset active application code as 'N/A' when port shutdown (#550) (20 hours ago) [ChiouRung Haung]
* 8ace0f8 - [Smartswitch] Fix time format for dpu states (#583) (29 hours ago) [Gagan Punathil Ellath]
* 7a0813a - [SmartSwitch] Enhance PCIe device check to skip the warning log, if device is in detaching mode (#546) (2 days ago) [Vasundhara Volam]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld