fix(build): Reduce Default bound requirement (#974)

Co-authored-by: David Pedersen <[email protected]>

tonic-build/src/client.rs

@@ -58,7 +58,7 @@ pub fn generate<T: Service>(
             where
                 T: tonic::client::GrpcService<tonic::body::BoxBody>,
                 T::Error: Into<StdError>,
-                T::ResponseBody: Default + Body<Data = Bytes> + Send  + 'static,
+                T::ResponseBody: Body<Data = Bytes> + Send  + 'static,
                 <T::ResponseBody as Body>::Error: Into<StdError> + Send,
             {
                 pub fn new(inner: T) -> Self {
@@ -69,6 +69,7 @@ pub fn generate<T: Service>(
                 pub fn with_interceptor<F>(inner: T, interceptor: F) -> #service_ident<InterceptedService<T, F>>
                 where
                     F: tonic::service::Interceptor,
+                    T::ResponseBody: Default,
                     T: tonic::codegen::Service<
                         http::Request<tonic::body::BoxBody>,
                         Response = http::Response<<T as tonic::client::GrpcService<tonic::body::BoxBody>>::ResponseBody>