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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I7e1c0da7f2cbadd7ca213e48bf7141bb61d3155a
diff --git a/types.hpp b/types.hpp
index 172d0c1..cfe0530 100644
--- a/types.hpp
+++ b/types.hpp
@@ -22,7 +22,7 @@
 
 using Path = std::string;
 using Property = std::string;
-using Value = sdbusplus::message::variant<bool, int64_t, std::string, Binary>;
+using Value = std::variant<bool, int64_t, std::string, Binary>;
 using PropertyMap = std::map<Property, Value>;
 
 using Interface = std::string;