[submodule] Update submodule sonic-dash-api to the latest HEAD automa…

…tically (sonic-net#20083)

#### Why I did it
src/sonic-dash-api
```
* 4919d9e - (HEAD -> master, origin/master, origin/HEAD) Allow `underlay_sip` to coexist with `vnet` in Route table (sonic-net#27) (4 hours ago) [Lawrence Lee]
```
#### How I did it
#### How to verify it
#### Description for the changelog