[submodule] Update submodule sonic-platform-common to the latest HEAD automatically (#16061)

#### Why I did it
src/sonic-platform-common
```
* 5af6f9f - (HEAD -> 202305, origin/202305) Comment out tx power validation check and program the passed value  (#389) (3 days ago) [abdosi]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld