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

…omatically (#18689)

#### Why I did it
src/sonic-swss-common
```
* 5a73792 - (HEAD -> master, origin/master, origin/HEAD) [subnet_decap] Introduce subnet decap tables (#861) (33 minutes ago) [Longxiang Lyu]
```
#### How I did it
#### How to verify it
#### Description for the changelog