[submodule] Update submodule sonic-dash-api to the latest HEAD automatically (sonic-net#25662)

#### Why I did it
src/sonic-dash-api
```
* 18a29c1 - (HEAD -> master, origin/master, origin/HEAD) Add step to compile Trixie in the CI builds (sonic-net#64) (56 seconds ago) [Saikrishna Arcot]
* 99a835c - Move route rule priority to key (sonic-net#62) (3 hours ago) [Lawrence Lee]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Signed-off-by: Feng Pan <fenpan@microsoft.com>

Author: mssonicbld