[submodule] Update submodule sonic-platform-common to the latest HEAD automatically (sonic-net#18010)

#### Why I did it
src/sonic-platform-common
```
* 538ec67 - (HEAD -> master, origin/master, origin/HEAD) Tx/Rx power values should be rounded up to 3 decimal places (sonic-net#432) (6 hours ago) [mihirpat1]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld