sdbusplus: remove deprecated variant_ns

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I8ae0323c7eabb6c0cde2126b07a7396b4e3e17ea
diff --git a/utils.hpp b/utils.hpp
index a22237a..5be8bf5 100644
--- a/utils.hpp
+++ b/utils.hpp
@@ -74,7 +74,7 @@
 template <typename V, typename Arg>
 auto convertVariant(Arg&& v)
 {
-    return sdbusplus::message::variant_ns::visit(MakeVariantVisitor<V>(), v);
+    return std::visit(MakeVariantVisitor<V>(), v);
 }
 
 /** @struct CompareFirst