[submodule] Update submodule sonic-swss-common to the latest HEAD automatically (sonic-net#21822)

#### Why I did it
src/sonic-swss-common
```
* 599b0a6 - (HEAD -> master, origin/master, origin/HEAD) c-api: README.md (sonic-net#974) (29 hours ago) [erer1243]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld