sdbusplus: remove deprecated variant_ns

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I369662a8ebaac80417cd75be26cc11a2f0dab535
diff --git a/utility.hpp b/utility.hpp
index af50127..0f7b312 100644
--- a/utility.hpp
+++ b/utility.hpp
@@ -61,7 +61,7 @@
     auto reply = bus.call(method);
 
     reply.read(property);
-    value = sdbusplus::message::variant_ns::get<T>(property);
+    value = std::get<T>(property);
 }
 
 /**