remove unnecessary std::move when constructing RapidYamlError

From a compile warning:

jsonnet/core/vm.cpp:3484:30: warning: moving a temporary object prevents copy elision [-Wpessimizing-move]
 3484 |         throw RapidYamlError(std::move(msg.str()));
      |                              ^
jsonnet/core/vm.cpp:3484:30: note: remove std::move call here
 3484 |         throw RapidYamlError(std::move(msg.str()));

Author: johnbartholomew

core/vm.cpp

@@ -3484,7 +3484,7 @@ class Interpreter {
             msg << loc.offset << ":";
         }
         msg << " " << std::string_view(inner_msg, length);
-        throw RapidYamlError(std::move(msg.str()));
+        throw RapidYamlError(msg.str());
     }
 };