PHP 8.2 deprecation error on dynamic property creation

Problem/Motivation

There's a couple of files in the module where a property is being dynamically created.
One is wingsuit_companion/src/StreamWrapper/WingsuitStreamWrapper.php
and the other one is in wingsuit_companion/modules/wingsuit_ui_patterns/src/Plugin/Deriver/LibraryDeriver.php

Proposed resolution

Declare the properties.