[submodule] Update submodule sonic-restapi to the latest HEAD automatically (#25249)

#### Why I did it
src/sonic-restapi
```
* 0ad2a61 - (HEAD -> master, origin/master, origin/HEAD) Extend prefix length for routes and advertisement (#180) (10 days ago) [Prince Sunny]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Signed-off-by: dprital <[email protected]>

Author: mssonicbld