generated code is incompatible with tonic 0.13

[mikea]

Lost of things seem to break:

• type alias tonic::body::BoxBody is private
• varios unsatisfied trait bounds like:

    = note: the following trait bounds were not satisfied:
            `Channel: Service<tonic::codegen::http::request::Request<http_body_util::combinators::box_body::UnsyncBoxBody<prost::bytes::Bytes, Status>>>`

[caspermeijn]

I don't understand what this issue is. It seems to me this is a tonic issue.

Could you add instructions for how to reproduce this? The best way to do that is to add a test to the prost codebase.