[submodule] Update submodule sonic-dbsyncd to the latest HEAD automatically (#15547)

#### Why I did it
src/sonic-dbsyncd
```
* e4ac906 - (HEAD -> master, origin/master, origin/HEAD) [actions] Support Semgrep by Github Actions (#59) (7 hours ago) [Mai Bui]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld