Don't read relhasoids on version 12. Also don't try to select data we are not allowed to read.

pglablib/catalog/PgSequence.h

@@ -16,6 +16,10 @@ public:
 	bool cycled = false;
 	bool called = false;
 
+	bool priv_usage = false;
+	bool priv_select = false;
+	bool priv_update = false;
+
 	using PgClass::PgClass;
 	QString createSql() const;
 };