Update sonic-swss submodule (#9609)

Includes below commits
```
38b616ba 2021-12-09 | [LGTM] lgtm to use 202106 branches of swss-common and sairedis (#2074) [Stephen Sun]
c68bad07 2021-12-07 | Fix random failure in PR/CI build. #2006 [Shilong Liu]
ba17675b 2021-08-23 | [ci]: fix artifacts download from swss-common and sairedis (#1882) [Guohan Lu]
```