port(qt6): minimal changes to build under qt6.6.2

[Zoyolin]

Hi I've just built the testProject under fedora to try out the framework for this : https://framagit.org/Zoyolin/domon It did fail just a little for sound handling has changed since qt5, it seemed a minor fix hence the pull request. We probably want include guard of some mechanism to prevent breaking qt5 build when integrating the changes.