sdbusplus: remove deprecated variant_ns

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6a3e7bb043371841838d241f2c4a9579d6ead4cb
diff --git a/mslverify/util.hpp b/mslverify/util.hpp
index eefc1cd..7e6e138 100644
--- a/mslverify/util.hpp
+++ b/mslverify/util.hpp
@@ -125,7 +125,7 @@
                    "Get"s, interface, property);
     ::sdbusplus::message::variant<Property> value;
     msg.read(value);
-    return ::sdbusplus::message::variant_ns::get<Property>(value);
+    return std::get<Property>(value);
 }
 
 /** @brief Get a property without mapper lookup. */