[submodule] Update submodule sonic-swss-common to the latest HEAD aut…

…omatically (#18492)

#### Why I did it
src/sonic-swss-common
```
* 6b56543 - (HEAD -> master, origin/master, origin/HEAD) Add "STATE_" prefix to ASIC SDK health/event table definition (#867) (5 hours ago) [Stephen Sun]
```
#### How I did it
#### How to verify it
#### Description for the changelog