sdbusplus: remove deprecated variant_ns

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6114c160d823de58e39cb4252ca5ae635de99ea0
diff --git a/user_mgr.cpp b/user_mgr.cpp
index 9694fd1..d1f881e 100644
--- a/user_mgr.cpp
+++ b/user_mgr.cpp
@@ -1028,9 +1028,7 @@
                     {
                         for (const auto &property : interface.second)
                         {
-                            auto value =
-                                sdbusplus::message::variant_ns::get<bool>(
-                                    property.second);
+                            auto value = std::get<bool>(property.second);
                             if ((property.first == "Enabled") &&
                                 (value == true))
                             {
@@ -1063,8 +1061,7 @@
 
                         for (const auto &property : interface.second)
                         {
-                            auto value = sdbusplus::message::variant_ns::get<
-                                std::string>(property.second);
+                            auto value = std::get<std::string>(property.second);
                             if (property.first == "GroupName")
                             {
                                 groupName = value;