refactor: removed dead commented code from serialize.h

Co-authored-by: Kittywhiskers Van Gogh <63189531+kwvg@users.noreply.github.com>

Author: knst

src/serialize.h

@@ -824,13 +824,6 @@ struct VectorFormatter
 template<typename Stream, typename A, typename B, typename C> void Serialize(Stream& os, const std::basic_string<A, B, C>& str);
 template<typename Stream, typename A, typename B, typename C> void Unserialize(Stream& is, std::basic_string<A, B, C>& str);
 
-/**
- *  SecureString
- */
-/*
-template<typename Stream, typename C> void Serialize(Stream& os, const SecureString& str);
-template<typename Stream, typename C> void Unserialize(Stream& is, SecureString& str);
-*/
 /**
  * prevector
  * prevectors of unsigned char are a special case and are intended to be serialized as a single opaque blob.