Migrate to Qt 6.3.1 (#52)

* Adhere to qt6 api

* Adhere to qt6 api

* New conan method

CMakeDeps and CMakeToolchain

Co-authored-by: Thomas Kroes <t.kroes@lumc.nl>
Co-authored-by: Baldur van Lew <b.van_lew@lumc.nl>