Fix non const-ref in loop

source/RobotAPI/libraries/armem/server/plugins/ReadWritePluginUser.cpp

@@ -123,7 +123,7 @@ namespace armarx::armem::server::plugins
     ReadWritePluginUser::predict(const armem::prediction::data::PredictionRequestSeq& requests)
     {
         armem::prediction::data::PredictionResultSeq result;
-        for (auto request : requests)
+        for (const auto& request : requests)
         {
             armem::PredictionResult singleResult;
             singleResult.success = false;