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

…atically (#20546)

#### Why I did it
src/sonic-utilities
```
* 4a6d1218 - (HEAD -> master, origin/master, origin/HEAD) [doc] correct the fec histogram output for show int counters fec-histogram (#3579) (9 hours ago) [vdahiya12]
```
#### How I did it
#### How to verify it
#### Description for the changelog