[submodule] Update submodule sonic-dash-api/sonic-dash-api to the latest HEAD automatically (#15725)

#### Why I did it
src/sonic-dash-api/sonic-dash-api
```
* 3f728d1 - (HEAD -> master, origin/master, origin/HEAD) Update vnet_direct in route.proto (#4) (11 days ago) [Ze Gan]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2023-07-06 16:39:13 +08:00 committed by GitHub
parent ca29197184
commit 673b8b86ff
No known key found for this signature in database
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@ -1 +1 @@
Subproject commit 30415cd41ef2ae62841417b4a6a9113129cd718d
Subproject commit 3f728d1bbf65d2e8c41bdc023d5c07702a7f848b