sdbusplus: remove deprecated variant_ns

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia4b7b6bd27bdcb68cb4ef6399f97966372bf4c2e
diff --git a/fault-monitor/fru-fault-monitor.cpp b/fault-monitor/fru-fault-monitor.cpp
index b71cbcc..955540c 100644
--- a/fault-monitor/fru-fault-monitor.cpp
+++ b/fault-monitor/fru-fault-monitor.cpp
@@ -183,8 +183,7 @@
         return;
     }
 
-    auto& assocs =
-        sdbusplus::message::variant_ns::get<AssociationList>(attr->second);
+    auto& assocs = std::get<AssociationList>(attr->second);
     if (assocs.empty())
     {
         // No associations skip
@@ -282,8 +281,7 @@
                 entry("REPLY_SIG=%s", reply.get_signature()));
             continue;
         }
-        auto& assocs =
-            sdbusplus::message::variant_ns::get<AssociationList>(assoc);
+        auto& assocs = std::get<AssociationList>(assoc);
         if (assocs.empty())
         {
             // no associations, skip