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

…omatically (sonic-net#21359)

#### Why I did it
src/sonic-swss-common
```
* 12c428e - (HEAD -> master, origin/master, origin/HEAD) [schema] add SRv6 config db tables (sonic-net#962) (21 hours ago) [Yakiv Huryk]
```
#### How I did it
#### How to verify it
#### Description for the changelog