sdbusplus: replace message::variant with std::variant

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Id416fbdec0a6d6b8e9eabfe058420865db3d1f08
diff --git a/mslverify/util.hpp b/mslverify/util.hpp
index 7e6e138..ae83006 100644
--- a/mslverify/util.hpp
+++ b/mslverify/util.hpp
@@ -16,7 +16,7 @@
 
 /** @brief Alias for PropertiesChanged signal callbacks. */
 template <typename... T>
-using Properties = std::map<std::string, sdbusplus::message::variant<T...>>;
+using Properties = std::map<std::string, std::variant<T...>>;
 
 namespace sdbusplus
 {
@@ -123,7 +123,7 @@
     auto msg =
         callMethod(bus, busName, path, "org.freedesktop.DBus.Properties"s,
                    "Get"s, interface, property);
-    ::sdbusplus::message::variant<Property> value;
+    ::std::variant<Property> value;
     msg.read(value);
     return std::get<Property>(value);
 }