[submodule] Update submodule sonic-dash-ha to the latest HEAD automatically (sonic-net#23157)

#### Why I did it
src/sonic-dash-ha
```
* b8ca7c1 - (HEAD -> master, origin/master, origin/HEAD) Change field_values deserializer to support serde(default) (#71) (4 hours ago) [yue-fred-gao]
* 1b6f04f - Test utils to test hamgrd in local workspace (#72) (4 hours ago) [yue-fred-gao]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld