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New version of fabric-protos uses updated protoc and protobuf versions, including protobuf-java v4. This change updates from protobuf-java v3 to v4.
The change to use generics in the newer generated gRPC client stubs means that the previous approach of mocking them using uber-go/mock is not possible. This change uses mockery to mock the gRPC client connection instead. Mockery does support mocking of most generics, and mocking at the connection allows unit testing to be done using the public API without test hooks to allow replacement of gRPC stubs.