[c++] Windows fix

cpp/src/vereign/grpc/server.cc

@@ -119,7 +119,7 @@ public:
 
     event_broker_->Shutdown();
 
-    auto deadline = std::chrono::high_resolution_clock::now() + shutdownTimeout;
+    auto deadline = std::chrono::system_clock::now() + shutdownTimeout;
 
     server_->Shutdown(deadline);
     if (server_thread_.joinable()) {