apainintheneck cd5b93a2f2 internal json v3: parse ruby source checksum correctly
Currently we are including this in the API but not actually
parsing and loading it correctly from the JSON. I think this
was an oversight when addressing feedback and refactoring
the JSON shape. Not a big deal, of course, because I'm the
only person using it right now.

I found this out while testing installs using the API and I got
this error while running `brew reinstall tree`.

```
Warning: Cannot verify integrity of '60fc4212023d3fef00e6de4b9f3f0d63402cf3eca00778d09f4f2d3481b524a1--tree.rb'.
No checksum was provided.
```
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