fixed an error

src/server/game/Scripting/ScriptReloadMgr.cpp

@@ -302,7 +302,7 @@ Optional<std::shared_ptr<ScriptModule>>
         TC_LOG_ERROR("scripts.hotswap", "Could not extract all required functions from the shared library \"%s\"!",
             path.generic_string().c_str());
 
-        return boost::none;
+        return std::nullopt;
     }
 }