Include auto-value-annotations as compileOnly

[dlew]

auto-value-annotations are only needed at compile-time,
and including them as part of the api can mess up other
builds that only include the annotations at compile-time.

Also bumped it up to the latest vesion (1.6.5)

Fixes #317

[google-oss-bot]

Hi @dlew. Thanks for your PR.

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[dlew]

We no longer use auto-value anymore, so this is sort of a moot point and I'm not going to bother getting this working again.