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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I7b04e16b91dbb6eb229cb2d0d528c56f6b2ea0ba
diff --git a/manager.hpp b/manager.hpp
index 34cfa55..85319fe 100644
--- a/manager.hpp
+++ b/manager.hpp
@@ -158,7 +158,7 @@
                           const std::string& objPath,
                           const std::string& property, const T& value)
     {
-        sdbusplus::message::variant<T> data = value;
+        std::variant<T> data = value;
 
         auto method = bus.new_method_call(service.c_str(), objPath.c_str(),
                                           DBUS_PROPERTY_IFACE, "Set");