[submodule] Update submodule sonic-utilities to the latest HEAD automatically (#20436)

#### Why I did it
src/sonic-utilities
```
* 3cf8c3c2 - (HEAD -> 202405, origin/202405) Fix key error when checking for UTILITIES_UNIT_TESTING env var (#3563) (10 hours ago) [HP]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld