Update dependencies and mark as isolating for APT

[ZacSweers]

Resolves a few things:

Resolves #112
Resolves #106

[rharter]

Looks great! Thanks!

[tbroyer]

Extension doesn't implement the new API to be marked as isolating.

Also, have you tested incrementality of the processor? It doesn't look like it declares originating elements for the generated sources, which is at least required for isolating processors (not sure about aggregating ones).

[ZacSweers]

that's... really strange o_O. I had it locally for sure, probably got lost in the bouncing around of repos.

For the processor - I was under the impression that aggregating processors didn't have to declare originating elements (since they could be from many places). I'll read up on the docs again

[ZacSweers]

I suppose that's implied here - https://docs.gradle.org/current/userguide/java_plugin.html

It just says isolating must have one, but doesn't specify anything explicitly for aggregating ones. Do you know if we also need to declare the annotated factory interface itself as an originating element? (Assuming yes)

Also - would extensions such as @Memoized imply that its extension should be aggregating since it depends on annotations outside of what's fetched in roundenvironment?

[ZacSweers]

I've added the missing bits in #114 if you want to review