Update Pharo 3.0 SHA sum

```
Error: SHA2 mismatch
Expected: f28424c66f296aae9628c9d54b6fc8590d6db0cd512b7116b06180aded6da428
Actual: 57f251d31726176bf7dff866198ca75f03bb477e1dd024307eb157725acf596f
Archive: /Library/Caches/Homebrew/pharo-3.0.zip
To retry an incomplete download, remove the file above.
```