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

…lly (#15785)

#### Why I did it
src/sonic-swss
```
* 776af62c - (HEAD -> master, origin/master, origin/HEAD) [CodeQL]: Use dependencies with relevant versions in azp template. (#2845) (4 hours ago) [Nazarii Hnydyn]
```
#### How I did it
#### How to verify it
#### Description for the changelog