add errorprone back in

[tballison]

When we run javadoc:aggregate, this dependency is needed. Would it cause problems if we added it? Do we need to exclude it from the other grpc dependencies where we're currently excluding it?

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[tballison]

@nddipiazza , I'm hesitant to merge this because of all the exclusions in the grpc pom for this artifact. We need it for javadoc-aggregate. Does it hurt grpc to include it?

There's no rush on this...sometime before we have to generate javadocs again. LOL...

Thank you!