Don't use pinned memory when unnecessary (#17832)

Reports of excessive GPU memory usage and errors
from cudaHostRegister. There are some cases where pinning is
not required.

core/src/serve_repair_service.rs

@@ -33,6 +33,7 @@ impl ServeRepairService {
             Recycler::default(),
             "serve_repair_receiver",
             1,
+            false,
         );
         let (response_sender, response_receiver) = channel();
         let t_responder =