[submodule] Update submodule sonic-utilities to the latest HEAD autom…

…atically (sonic-net#15798)

#### Why I did it
src/sonic-utilities
```
* 7ca31477 - (HEAD -> master, origin/master, origin/HEAD) [db_migrator] Set docker_routing_config_mode to the value obtained from minigraph parser (sonic-net#2890) (10 hours ago) [Vaibhav Hemant Dixit]
```
#### How I did it
#### How to verify it
#### Description for the changelog