Tests fail to compile with `proto3-suite` >= 0.5.0

[Friede80]

Brought up in #22

When using proto3-suite >= 0.5.0

Building test suite 'test' for grpc-mqtt-0.1.0.0..
[ 1 of 16] Compiling Proto.Message    ( gen/test/Proto/Message.hs, /home/matt/Code/grpc-mqtt/dist-newstyle/build/x86_64-linux/ghc-8.10.4/grpc-mqtt-0.1.0.0/t/test/build/test/test-tmp/Proto/Message.o, /home/matt/Code/grpc-mqtt/dist-newstyle/build/x86_64-linux/ghc-8.10.4/grpc-mqtt-0.1.0.0/t/test/build/test/test-tmp/Proto/Message.dyn_o ) [Proto3.Suite.Types changed]
[ 2 of 16] Compiling Proto.Service    ( gen/test/Proto/Service.hs, /home/matt/Code/grpc-mqtt/dist-newstyle/build/x86_64-linux/ghc-8.10.4/grpc-mqtt-0.1.0.0/t/test/build/test/test-tmp/Proto/Service.o, /home/matt/Code/grpc-mqtt/dist-newstyle/build/x86_64-linux/ghc-8.10.4/grpc-mqtt-0.1.0.0/t/test/build/test/test-tmp/Proto/Service.dyn_o ) [Network.GRPC.HighLevel.Server.Unregistered changed]

gen/test/Proto/Service.hs:143:30: error:
    Not in scope: ‘optMaxMetadataSize’
    |
143 |                              optMaxMetadataSize = serverMaxMetadataSize})
    |                              ^^^^^^^^^^^^^^^^^^

This looks like its related to this change in grpc-haskell: awakesecurity/gRPC-haskell@1127770

[Friede80]

Ahh, I think I see what is happening. Our nix overlay pins grpc-haskell built with proto3-suite-0.4.3, so when I fix proto3-suite >= 0.5.0, cabal resolves the dependencies and tries to use grpc-haskell-0.1.0 because that is the latest version on Hackage.

So I think the only real issue here is that we should add the version contraint grpc-haskell >= 0.3.0