Fix missing include on GCC 10.2 on ARM (Bootlin toolchain)

Change-Id: Ie1e13d38f436e42e35d6c78eca8b9eb508ea1cb0
diff --git a/src/datastore_access.hpp b/src/datastore_access.hpp
index 63df0bb..3729872 100644
--- a/src/datastore_access.hpp
+++ b/src/datastore_access.hpp
@@ -9,6 +9,7 @@
 #pragma once
 
 #include <map>
+#include <memory>
 #include <optional>
 #include <string>
 #include "yang_operations.hpp"