sdbusplus: remove deprecated variant_ns

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I71d7b6037c339c611545134b45a082c7af905c3a
diff --git a/include/pulse_event_monitor.hpp b/include/pulse_event_monitor.hpp
index 6f05e82..4402453 100644
--- a/include/pulse_event_monitor.hpp
+++ b/include/pulse_event_monitor.hpp
@@ -36,8 +36,8 @@
 
         std::string event = propertiesChanged.begin()->first;
 
-        auto variant = sdbusplus::message::variant_ns::get_if<std::string>(
-            &propertiesChanged.begin()->second);
+        auto variant =
+            std::get_if<std::string>(&propertiesChanged.begin()->second);
 
         if (event.empty() || nullptr == variant)
         {