[submodule] Update submodule sonic-swss to the latest HEAD automatically (#15635)

#### Why I did it
src/sonic-swss
```
* a67f684f - (HEAD -> master, origin/master, origin/HEAD) [hash]: Implement GH backend (#2598) (3 hours ago) [Nazarii Hnydyn]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2023-06-27 16:37:39 +08:00 committed by GitHub
parent 4449d473ae
commit bacba1f988
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23

@ -1 +1 @@
Subproject commit 7fe76e001d4367c508c26816c95ba9d182ea333f
Subproject commit a67f684f448d45c5b6c4a7be6ccd4218d0ccd57e