sdbusplus: remove deprecated variant_ns

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: If06a676c19b2005c388a6ac48ba2d9f13e7615b2
diff --git a/sdbusplus.hpp b/sdbusplus.hpp
index b441d80..4064f5c 100644
--- a/sdbusplus.hpp
+++ b/sdbusplus.hpp
@@ -348,7 +348,7 @@
             }
             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 with mapper lookup. */
@@ -442,7 +442,7 @@
             }
             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. */