New year, new copyright, new expected unknown issues with various files
that won't be covered by the script and/or will be but shouldn't change.
I'll do the details on Jan 1, but would appreciate this being
preapproved so I can actually get it merged by then.
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* Upgrade protobuf-java and scalapb.
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* Bazel: Generate ScalaPB classes without `unknownFields`.
This is very annoying because it means that extractors need an extra
`_` for no good reason. It also breaks Circe's automatic derivation.
Including unknown fields is the default behavior in Protocol Buffers for
Java now, and we'll probably have to reckon with it at some point, but
let's kick that can down the road a little.
* Upgrade protobuf-java to 3.17.1.
This is identical to 3.17.0, but let's track it anyway.
* Bazel: Move ScalaPB versions into their own file.
They don't need to go into the generated one.
