sdbusplus: replace message::variant with std::variant

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ifeb64ec42f9210b5640754e8a065d954f617ca44
diff --git a/utils.hpp b/utils.hpp
index be78f9e..0e30fa2 100644
--- a/utils.hpp
+++ b/utils.hpp
@@ -67,7 +67,7 @@
     method.append(interface, propertyName);
     try
     {
-        sdbusplus::message::variant<T> value{};
+        std::variant<T> value{};
         auto reply = bus.call(method);
         reply.read(value);
         return std::get<T>(value);