Update SHA2 hash of iannix

Installing the `iannix` cask is currently triggering following error:

```
Error: SHA2 mismatch
Expected: db8cef8f1250cbd6aab6b87ed3a50aa6b3dc0e8f3246ca91c211a314149c86dd
Actual: b45d332fc450342ad9a5b73fedcd554c299d435f989f0fe099522554434d00de
Archive: /Library/Caches/Homebrew/iannix-0.9.16.dmg
To retry an incomplete download, remove the file above.
```

This is fixing it.